Do you have all the plugins updated?
http://yanfly.moe/yep/changelog/
Soo I just checked, actually the battleAI core was the last plugin which was not up to date, so I updated it, then saved and closed then reopened the project, but the bug is still here unfortunately
:(
Here are all my plugins installed : Core Engine, Battle Engine Core, Skill core, Skillshop, X_SkillCooldowns, X_SkillTaunt, BattleAICore, X_VisualHpGauge, BattleStatusWindow, BuffsStatesCore.
Because I installed them all together in one session of 2 hours, and did not notice the bug up to the point where I tried to kill an ennemy, I cannot really say which one is causing it
:(
I wonder if it is not something that happened when I replaced the old Battle Engine Core by its newer version. Like for example, the old version used the immortal status for something (?) and when I erased the old version for the new version which does not use it anymore somehow an old setting from the old version was saved in the process and is now making my ennemies bugging. Just trying to guess....
EDIT: I have tried every combinations possible (deactivating plugins one by one then reactivating them) and the bug still remains. Even with all plugins set on "OFF" the bug is still there lol.
EDIT 2: I have created a new project, reinstalled all the plugins, and I could not reproduce the bug this time. I think my old project is corrupted for some reasons. I did not do too much on it so I will just work on the new one now, it is okay