When I peak or dig to fast blocks, "ghost blocks" are generated
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Duplicate of MC-157369
I've been encountering the same issue.
I was digging a lot of dirt, and every minute i'd run into one, I'd then place a block, and Viola!, and new gravel block.
I was using an efficiency 5 diamond shovel.
I've seen this twice now in 1.14.4. Interestingly, I haven't seen it when mining with haste II and an efficiency V pick axe. In both instances, I experienced ghost blocks when using my Efficiency V Shovel on Dirt Blocks WITHOUT haste of any kind. I logout / login and see the ghost block show up. I hope that helps.