Describe the bug you're experiencing

The line
final BossCapability cap = ((BossCapEntity)(Object)this).getBossCap();
in LivingDeathMixin can cause Class cast exceptions, which crashes the game. Please add a proper check. This issue is still existing on newer versions as well, as the code hasn't changed.

Reproducability

With the JCraft mod:
/stand set YourName MAGICIAN_RED
Then use Special 3 attack (default: M) of Magician Red on a sheep or something.

Mod up to date

• Before submitting this issue I updated to the newest version and reproduced it

Minecraft version

1.19

Modloader version

Fabric

Logs and Datapacks

https://gist.github.com/Ayutac/bcf4ffe05802a9fcaaeaec0edb9fe692

fixed in 6.9