Well well well. Somehow, I got memory violation error during 3-6 boss fight. Console message is quite informative: `Unity Engine: Memory Violation error in object 0x623f72ba`. Fun-freaking-tastic! 3-6 is a wall for me. You feel like you're finally winning? Here, take this `F U` Unity error.
All I can say, boss had patched field and number distortion mods. Maybe chainmines also, dunno. I had mines counter lens and column reveal stick. I just opened a questionable cell, so, it might be something about counting 3*3 explosions on void patches. Or not. It's totally not about free RAM as I had slightly more than 8Gb free.
That's all. Good luck backtracking bugs with this!