Oh good. That's part of why I didn't have the enemies or gates reset after a ko. I'll try and recreate the invulnerability bug on my side. (Were you using Windows 10?)
I was using win11, tho i dont remember how i got into that bug since i only realised the bug half way through the boss.
Okay, I'll keep an eye out for it in the next round of testing. Thank you again for the feedback and advice!