When mining Coal Ore the block sometimes reappears. It doesn't drop anything, but I have to mine the block again. Only seems to happen when mining Coal Ore. I also tested with a few pickaxes, seems to happen the most with my Fortune III, Unbreaking III, Mending I, Efficiency IV Pickaxe, tested both Diamond and Netherite. I also tested both on my server and on singleplayer and it happens in both instances. Similar pickaxe with Silk Touch instead of Fortune doesn't seem to have the same problem. I've noticed this issue before in the past, it doesn't always happen but when it does it's annoying.