Merms Revert and lose loyalty with bosses...

I don't know if it happens on other platforms, but since I can only play on the Switch version at the moment, it's quite annoying. 

During certain boss fights, royal merm guards lose their lunar affinity mutation and loyalty mid fight and casually leave. It seems to be at random or with certain attacks. 

I first found this bug when rematching the Celestial champion with a full lunar merm army. At some point in the fight, I've noticed this behavior and thought to myself "makes sense, a being infussed with lunar power can take it away" and didn't think much of it. Later on, I've noticed that Toadstool does it too. There I am pathetically struggling in the fight and to my surprise I see once again merms transforming back and walking away. 

It's annoying to set up a bunch of houses and community dishes just to find this bug that makes it all null. 

Not all bosses do this and I have yet to find out if it happens with shadow aligned merms because I haven't unlocked them yet.