Heya, finally caught the level 9 bug but had to check the community pinned post since I was being mislead by a very interesting bug.
I basically took a leap of faith at the bottom of the map since I saw no way to reach the bug other than stepping on invisible floor outside the collider range... and there WAS.
Obviously I didn't know the collider path changed with each reset so I stayed on that level checking the invisible solid floor for a while before giving up without being able to reach the golden cockroach.
The invisible floor can be stepped on by moving to the bottom edge of the map (seen from below with the map correctly oriented) and simply stepping past it 1 (and I think 2 too) tile forward.
You'll see the character standing mid-air and able to move along the edge just fine skipping past any 0s next to it as long as it stays outside of the map.
Doesn't happen on other edges tho so you can't really do much past that.