Two things: first, you need to hold down left click the whole time. And second, just after you break the block in spectator (it resets to no breaking) release left click. then go into survival again without further breaking the block.
Two things: first, you need to hold down left click the whole time. And second, just after you break the block in spectator (it resets to no breaking) release left click. then go into survival again without further breaking the block.