That isn't a bustable block, though, it's a shatter block. This behavior is probably somewhat intentional, given that the maze in DSZ2 uses it to hide things inside the blocks. However, I agree that there should probably be a way of opting out to this feature.
One thing you can try is using the same control sector to feed an invisible, tangible FOF with the same tag. If you make it so that the invisible FOF is only tangible to non-players (there's a flag for that), then objects will rest on the invisible FOF while players will still go through and break the shatter block. Then, because shattering the block just messes with the control sector heights, the invisible block will move along with the shatter block and everything should Just Work like magic.