//regen fails due async catching been on chunk entity add/remove

[LaurenceBarnes]

/fawe debugpaste: https://athion.net/ISPaster/paste/view/451bb19d003843d29c9d41b55492fd32

another attempt with FAWE-591: https://pastebin.com/4Gjvpzan

Required Information

• FAWE Version Number (/version FastAsyncWorldEdit): 587-591
• Spigot/Paper Version Number (/version): Tuinity-183
• Minecraft Version: 1.16.5

Describe the bug //regen doesn't work and spits out an error in console

To Reproduce Steps to reproduce the behavior:

1. Mark pos1 and pos2
2. do //regen
3. See error in console

Plugins being used on the server 1L1D, BetterGiants, BKCommonLib, BlockLocker, Core, CoreProtect, CustomCommands, DeadChest, dynmap, Enchantments_plus, Essentials, EssentialsGeoIP, FastAsyncWorldEdit (WorldEdit), GSit, HolographicDisplays, ItemJoin, ItemSlotMachine, LevelledMobs, LibsDisguises, LightCleaner, LuckPerms, Maplands, My_Worlds, MythicMobs, Negativity, OpenInv, PlaceholderAPI, PlugMan, ProtocolLib, PsudoCommand, QuickShop, SilkSpawners, TAB, TCCoasters, TCPShield, TimeIsMoney*, Train_Carts, UniqueRewards, Vault, ViaBackwards, ViaVersion, Vivecraft-Spigot-Extensions, WorldEditSelectionVisualizer, WorldGuard

Checklist:

• [X] I included all information required in the sections above
• [X] I made sure there are no duplicates of this report (Use Search)
• [X] I made sure I am using an up-to-date version of FastAsyncWorldEdit for 1.16.5
• [X] I made sure the bug/error is not caused by any other plugin

[NotMyFault]

Can replicate.

[TheNety]

Happens also on regular Paper 1.16.5