Nice block, but it has some issues. First one is that it doesn't work properly in vertical levels. Once you collect a block, it may or may not disappear, plus causing cutoff in other completely random locations.
The other one is minor and doesn't affect gameplay, and seems to happen only on bsnes/higan. When I grab the block, it disappears normally (talking about interaction), but causes graphical cutoff, as seen in the screenshots below.
Tested insertion with both BTSD and GPS. It gives me the same results.