Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex edit at $00EEB2 in the ROM map, you can replay the level without a problem.
I am having an issue where it doesn't spawn from a block correctly. When you activate the block from below, you see a "turn block" emerge from the top of the block, then it turns into the poison mushroom.
Does anyone know how to fix this? No one is helping me for some reason.