When taking damage when wearing Pyromancer or Aquamancer gear (T4 armour), when Deeper and Darker is installed, the server instantly crashes.

When the Forge settings "removeErroringBlockEntities" and "removeErroringEntities" are set to 'true', all damage sources disappear (arrows, zombies, etc.)

"java.lang.AbstractMethodError: Receiver class alexthw.ars_elemental.common.items.armor.AAMaterials$ModdedArmorMaterial does not define or inherit an implementation of the resolved method 'abstract java.lang.String m_6082_()' of interface net.minecraft.world.item.ArmorMaterial.
at com.kyanite.deeperdarker.DeeperDarkerEvents.lambda$livingDamageEvent$2(DeeperDarkerEvents.java:143) ~[deeperdarker-forge-1.20.1-1.3.0.jar%23475!/:1.3.0] {re:classloading}..."

Attached are some server crash logs.
crash-2024-09-06_14.58.54-server.txt
crash-2024-09-06_13.39.33-server.txt
crash-2024-09-06_13.59.19-server.txt

https://www.curseforge.com/minecraft/mc-mods/deeperdarker/files/5698212

see changelog