LifeForce PPU bug after killing any boss

[Zelex]

Anybody seen this before? It looks like the same tiles are repeated the whole way down the screen. Happens immediately after beating a boss.

It appears to only be a PPU issue, as the game will continue on like normal after a few seconds. Presumably after the death explosion animation (which is the part that messes up).

[Zelex]

Looking around in FCEUX debugger, it looks like the background tile rendering is disabled or something.

[Zelex]

nevermind, I found it. Was a bug when background rendering was disabled.