Enchantments cause falses due to new 1.21 attributes and PacketEvents unable to read enchants

[Devuxious]

Describe the false positive and how to replicate it

Here are some issues I encountered within the first five minutes of using this anticheat:

• Using a trident in water results in a simulation flag.
• Swimming with the Depth Strider enchantment also triggers a simulation flag.
• Using a pickaxe with any efficiency enchantment causes a fast break flag.

There are likely more issues, but I haven't had the chance to test further yet.

Grim version

2.3.65

Server version

Paper 1.21-38-master@1f5db50

Plugins

CoreProtect, Delta (custom core), FastAsyncWorldEdit, PlaceholderAPI

[SamB440]

It's not ignoring them, it's because Mojang completely changed the calculations in 1.21

[Cats1337]

I've also found this issue. Efficiency sets off fastbreak alert, depth strider sets off simulation alert and drowns players. I tried to modify the config to help with it but to no avail. Packets clearly aren't being handled correctly.

[SamB440]

Please read what I said, it's not a packet issue, it's an issue with viaversion + Mojang changing everything to use attributes which also changed the movement calculations. My attribute-rework branch fixes this, but it is complicated to fix: https://github.com/GrimAnticheat/Grim/blob/16a90bb41db1841c9e821ed7352ecd109186e44a/src/main/java/ac/grim/grimac/utils/data/packetentity/PacketEntitySelf.java#L58-L78

[Incluuu]

I've also found this issue. Efficiency sets off fastbreak alert, depth strider sets off simulation alert and drowns players. I tried to modify the config to help with it but to no avail. Packets clearly aren't being handled correctly.

I have te same problem

[SergioK29]

Can confirm this issue