if a falling block entity with the block being any unobtainable block is summoned with commands and lands on a torch it drops as an item and there might be some glitch for players to get that falling block entity in survival.
if a falling block entity with the block being any unobtainable block is summoned with commands and lands on a torch it drops as an item and there might be some glitch for players to get that falling block entity in survival.
I don't think it's possible to get a falling unobtainable block in survival.