Bosses do not attack with melee weapons

Bosses with melee weapons are using the default settings, but they just stand there without attacking at all.
The player can defeat them without any risk.
Throwing weapons are also rarely used.
Is there any way to fix this?
Other weapons such as guns work fine.
I tried changing the melee weapon in various ways (knife, hatchet, etc.) but there was no change.
The settings are using the default settings.