Some mobs won’t despawn after uses of /s

[ohowe1]

Describe the bug A clear and concise description of what the bug is. Some mobs won’t despawn after player uses /s

To Reproduce Steps to reproduce the behavior:

1. /s
2. /s again
3. some of the mobs may not despawn

Minecraft version 1.16.3

Console error none

Expected behavior After the player gets back into survival mode the mobs will despawn normally

[Karloss0x]

Well i'm not installing that plugin on my server unless it's repaired. But i can tell you everything i knew about that problem.

So when you use /s it makes mobs not to despawn. It's becouse all mobs gets [nbt={PersistenceRequired:1b}] (idk if they gets it as they spawn or after using /s ). Always when i got to newly spawned mob and used /data get (entity) it showed his persistence 1 . It works on every(what i know every) hostile mob and underwater mobs.

So what i think it's needed to be done is to change that nbt to 0 after exiting /s... But make it so it won't change [nbt={PersistenceRequired:1b}] to mobs which get that by using name tag or holding item. Iam really new to programming but what i think could help is to tag all the mobs(not selecting mobs with already having persistence 1) when using /s which get [nbt={PersistenceRequired:1b}] and after exiting /s change it back to [nbt={PersistenceRequired:0b}]

Some of my logs

Data of mob when SMP was active

`INFO]: [CHAT] [23:49:58] ...get entity<--[HERE] [23:50:05] [main/INFO]: [CHAT] [23:50:05] Zombie has the following entity data: {Paper.SpawnReason: "NATURAL", DeathTime: 0s, Bukkit.updateLevel: 2, LeftHanded: 0b, OnGround: 1b, AbsorptionAmount: 0.0f, IsBaby: 0b, Attributes: [{Name: "minecraft:generic.knockback_resistance", Modifiers: [{Name: "Random spawn bonus", Amount: 0.03636132108364637d, Operation: 0, UUID: [I; -1163077348, -128692274, -1223860204, 1910798811]}], Base: 0.0d}, {Name: "minecraft:generic.movement_speed", Base: 0.23000000417232513d}, {Name: "minecraft:generic.max_health", Base: 20.0d}, {Name: "minecraft:generic.follow_range", Modifiers: [{Name: "Random spawn bonus", Amount: 0.04050568929243499d, Operation: 1, UUID: [I; 226668665, 1527204574, -1790905154, 457888333]}], Base: 35.0d}, {Name: "minecraft:zombie.spawn_reinforcements", Base: 0.09940933846906672d}], Invulnerable: 0b, Brain: {memories: {}}, Paper.Origin: [-238.5d, 16.0d, 540.5d], Bukkit.Aware: 1b, HandDropChances: [0.085f, 0.085f], Rotation: [178.36017f, 0.0f], ArmorDropChances: [0.085f, 0.085f, 0.085f, 0.085f], HurtByTimestamp: 0, CanBreakDoors: 1b, WorldUUIDMost: 5540158239057003997L, InWaterTime: -1, ArmorItems: [{}, {}, {}, {}], Air: 300s, HandItems: [{}, {}], UUID: [I; -1286566652, -581091212, -1082313815, 352825367], Spigot.ticksLived: 463, DrownedConversionTime: -1, FallDistance: 0.0f, WorldUUIDLeast: -6728740248323109766L, Motion: [0.0d, -0.0784000015258789d, 0.0d], Pos: [-242.50357260417977d, 18.0d, 536.8162078831737d], Fire: -1s, CanPickUpLoot: 0b, Health: 20.0f, HurtTime: 0s, FallFlying: 0b, PersistenceRequired: 1b, PortalCooldown: 0, Paper.ShouldBurnInDay:1b}`

Data of mob when smp wasn't active

[CHAT] [00:08:17] Set own game mode to Spectator Mode [00:08:31] [main/INFO]: [CHAT] [00:08:31] Zombie has the following entity data: {Paper.SpawnReason: "NATURAL", DeathTime: 0s, Bukkit.updateLevel: 2, LeftHanded: 0b, OnGround: 1b, AbsorptionAmount: 0.0f, IsBaby: 0b, Attributes: [{Name: "minecraft:generic.knockback_resistance", Modifiers: [{Name: "Random spawn bonus", Amount: 0.029347070356939748d, Operation: 0, UUID: [I; -199214717, 878987475, -1360390221, 1970015198]}], Base: 0.0d}, {Name: "minecraft:generic.attack_damage", Base: 3.0d}, {Name: "minecraft:generic.movement_speed", Base: 0.23000000417232513d}, {Name: "minecraft:generic.max_health", Base: 20.0d}, {Name: "minecraft:generic.follow_range", Modifiers: [{Name: "Random spawn bonus", Amount: -0.04899566562761162d, Operation: 1, UUID: [I; 1337662829, 1380992392, -1626008649, -1591468074]}], Base: 35.0d}, {Name: "minecraft:zombie.spawn_reinforcements", Base: 0.09382664602122565d}], Invulnerable: 0b, Brain: {memories: {}}, Paper.Origin: [-273.5d, 48.0d, 591.5d], Bukkit.Aware: 1b, HandDropChances: [0.085f, 0.085f], Rotation: [89.65526f, 0.0f], ArmorDropChances: [0.085f, 0.085f, 0.085f, 0.085f], HurtByTimestamp: 0, CanBreakDoors: 0b, WorldUUIDMost: 5540158239057003997L, InWaterTime: -1, ArmorItems: [{}, {}, {}, {}], Air: 300s, HandItems: [{id: "minecraft:iron_sword", tag: {Damage: 0}, Count: 1b}, {}], UUID: [I; 546064478, -1879488029, -1161067629, 1705419454], Spigot.ticksLived: 442, DrownedConversionTime: -1, FallDistance: 0.0f, WorldUUIDLeast: -6728740248323109766L, Motion: [0.0d, -0.0784000015258789d, 0.0d], Pos: [-275.69999998807907d, 48.0d, 591.4891701025883d], Fire: -1s, CanPickUpLoot: 1b, Health: 20.0f, HurtTime: 0s, FallFlying: 0b, PersistenceRequired: 0b, PortalCooldown: 0, Paper.ShouldBurnInDay: 1b}

some screenshots

   

[ohowe1]

Thanks. When the player executes /s, it puts all the mobs into persistence 1 that are not already in persistence 1 and saves there uuids. When they un /s it takes all the uuids and changes the persistence to 0. A problem with this is that I'm pretty sure that when the server restarts all the uuids of the mobs change (I could be wrong about this). I think one of the only ways to fix this would be to persistence 0 all the mobs with the uuids as the server is shutting down, with players still in spectator mode. Would that be an ok compromise?

Edit: This seems not to be the case and is being caused by something else

[ohowe1]

Well i'm not installing that plugin on my server unless it's repaired. But i can tell you everything i knew about that problem.

So when you use /s it makes mobs not to despawn. It's becouse all mobs gets [nbt={PersistenceRequired:1b}] (idk if they gets it as they spawn or after using /s ). Always when i got to newly spawned mob and used /data get (entity) it showed his persistence 1 . It works on every(what i know every) hostile mob and underwater mobs.

So what i think it's needed to be done is to change that nbt to 0 after exiting /s... But make it so it won't change [nbt={PersistenceRequired:1b}] to mobs which get that by using name tag or holding item. Iam really new to programming but what i think could help is to tag all the mobs(not selecting mobs with already having persistence 1) when using /s which get [nbt={PersistenceRequired:1b}] and after exiting /s change it back to [nbt={PersistenceRequired:0b}]

Some of my logs Data of mob when SMP was active INFO]: [CHAT] [23:49:58] ...get entity<--[HERE] [23:50:05] [main/INFO]: [CHAT] [23:50:05] Zombie has the following entity data: {Paper.SpawnReason: "NATURAL", DeathTime: 0s, Bukkit.updateLevel: 2, LeftHanded: 0b, OnGround: 1b, AbsorptionAmount: 0.0f, IsBaby: 0b, Attributes: [{Name: "minecraft:generic.knockback_resistance", Modifiers: [{Name: "Random spawn bonus", Amount: 0.03636132108364637d, Operation: 0, UUID: [I; -1163077348, -128692274, -1223860204, 1910798811]}], Base: 0.0d}, {Name: "minecraft:generic.movement_speed", Base: 0.23000000417232513d}, {Name: "minecraft:generic.max_health", Base: 20.0d}, {Name: "minecraft:generic.follow_range", Modifiers: [{Name: "Random spawn bonus", Amount: 0.04050568929243499d, Operation: 1, UUID: [I; 226668665, 1527204574, -1790905154, 457888333]}], Base: 35.0d}, {Name: "minecraft:zombie.spawn_reinforcements", Base: 0.09940933846906672d}], Invulnerable: 0b, Brain: {memories: {}}, Paper.Origin: [-238.5d, 16.0d, 540.5d], Bukkit.Aware: 1b, HandDropChances: [0.085f, 0.085f], Rotation: [178.36017f, 0.0f], ArmorDropChances: [0.085f, 0.085f, 0.085f, 0.085f], HurtByTimestamp: 0, CanBreakDoors: 1b, WorldUUIDMost: 5540158239057003997L, InWaterTime: -1, ArmorItems: [{}, {}, {}, {}], Air: 300s, HandItems: [{}, {}], UUID: [I; -1286566652, -581091212, -1082313815, 352825367], Spigot.ticksLived: 463, DrownedConversionTime: -1, FallDistance: 0.0f, WorldUUIDLeast: -6728740248323109766L, Motion: [0.0d, -0.0784000015258789d, 0.0d], Pos: [-242.50357260417977d, 18.0d, 536.8162078831737d], Fire: -1s, CanPickUpLoot: 0b, Health: 20.0f, HurtTime: 0s, FallFlying: 0b, PersistenceRequired: 1b, PortalCooldown: 0, Paper.ShouldBurnInDay:1b} Data of mob when smp wasn't active [CHAT] [00:08:17] Set own game mode to Spectator Mode [00:08:31] [main/INFO]: [CHAT] [00:08:31] Zombie has the following entity data: {Paper.SpawnReason: "NATURAL", DeathTime: 0s, Bukkit.updateLevel: 2, LeftHanded: 0b, OnGround: 1b, AbsorptionAmount: 0.0f, IsBaby: 0b, Attributes: [{Name: "minecraft:generic.knockback_resistance", Modifiers: [{Name: "Random spawn bonus", Amount: 0.029347070356939748d, Operation: 0, UUID: [I; -199214717, 878987475, -1360390221, 1970015198]}], Base: 0.0d}, {Name: "minecraft:generic.attack_damage", Base: 3.0d}, {Name: "minecraft:generic.movement_speed", Base: 0.23000000417232513d}, {Name: "minecraft:generic.max_health", Base: 20.0d}, {Name: "minecraft:generic.follow_range", Modifiers: [{Name: "Random spawn bonus", Amount: -0.04899566562761162d, Operation: 1, UUID: [I; 1337662829, 1380992392, -1626008649, -1591468074]}], Base: 35.0d}, {Name: "minecraft:zombie.spawn_reinforcements", Base: 0.09382664602122565d}], Invulnerable: 0b, Brain: {memories: {}}, Paper.Origin: [-273.5d, 48.0d, 591.5d], Bukkit.Aware: 1b, HandDropChances: [0.085f, 0.085f], Rotation: [89.65526f, 0.0f], ArmorDropChances: [0.085f, 0.085f, 0.085f, 0.085f], HurtByTimestamp: 0, CanBreakDoors: 0b, WorldUUIDMost: 5540158239057003997L, InWaterTime: -1, ArmorItems: [{}, {}, {}, {}], Air: 300s, HandItems: [{id: "minecraft:iron_sword", tag: {Damage: 0}, Count: 1b}, {}], UUID: [I; 546064478, -1879488029, -1161067629, 1705419454], Spigot.ticksLived: 442, DrownedConversionTime: -1, FallDistance: 0.0f, WorldUUIDLeast: -6728740248323109766L, Motion: [0.0d, -0.0784000015258789d, 0.0d], Pos: [-275.69999998807907d, 48.0d, 591.4891701025883d], Fire: -1s, CanPickUpLoot: 1b, Health: 20.0f, HurtTime: 0s, FallFlying: 0b, PersistenceRequired: 0b, PortalCooldown: 0, Paper.ShouldBurnInDay: 1b} some screenshots

I have found the problem to the bug and have fixed it. Expect an update soon. Thanks Edit: Update pushed to spigot. Be sure to read the update description