When a mob touches a campfire (soul or normal), the server crashes completely.
This happens on a server generated directly in 1.21 and on servers generated in 1.20.4 migrated to 1.21 (I haven't done any other version testing).

this happens on several mobs (not all tested)

Full log in attachment :

[00:39:15] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.ReportedException: Colliding entity with block
    at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:1478) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.dedicated.DedicatedServer.c(DedicatedServer.java:406) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1321) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.MinecraftServer.y(MinecraftServer.java:1071) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]
Caused by: java.lang.IllegalStateException: Unhandled damage of EntityPillager['Pillager'/873, l='ServerLevel[world]', x=2200.86, y=59.89, z=-6075.00] by CraftBlock{pos=BlockPosition

{x=2200, y=59, z=-6076}

,type=SOUL_CAMPFIRE,data=Block{minecraft:soul_campfire}[facing=west,lit=true,signal_fire=false,waterlogged=false],fluid=net.minecraft.world.level.material.FluidTypeEmpty@1b8f9e0f} from inFire
    at org.bukkit.craftbukkit.v1_21_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:1010) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at org.bukkit.craftbukkit.v1_21_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:957) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at org.bukkit.craftbukkit.v1_21_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:1106) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.actuallyHurt(EntityLiving.java:2177) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.a(EntityLiving.java:1432) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.raid.EntityRaider.a(EntityRaider.java:273) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.level.block.BlockCampfire.a(BlockCampfire.java:108) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.level.block.state.BlockBase$BlockData.a(BlockBase.java:1094) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.Entity.aT(Entity.java:1336) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.Entity.aG(Entity.java:1036) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.Entity.a(Entity.java:978) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.a(EntityLiving.java:2886) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.a(EntityLiving.java:2820) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.m_(EntityLiving.java:3366) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityInsentient.m_(EntityInsentient.java:667) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.monster.EntityMonster.m_(SourceFile:44) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.raid.EntityRaider.m_(EntityRaider.java:110) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityLiving.l(EntityLiving.java:2996) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.entity.EntityInsentient.l(EntityInsentient.java:434) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.level.WorldServer.a(WorldServer.java:889) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.level.World.a(World.java:684) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.level.WorldServer.lambda$tick$2(WorldServer.java:459) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.world.level.entity.EntityTickList.a(SourceFile:54) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.level.WorldServer.a(WorldServer.java:439) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    at net.minecraft.server.MinecraftServer.c(MinecraftServer.java:1472) ~[spigot-1.21-R0.1-SNAPSHOT.jar:4196-Spigot-146439e-a4c2ee7]
    ... 5 more
[00:39:15] [Server thread/ERROR]: This crash report has been saved to: /home/guigui/Bureau/serer minecraft/serer minecraft/crash-reports/crash-2024-06-14_00.39.15-server.txt