This seems to happen every time you either die or log out. However, placing your beacon plots will preserve them. In order to reproduce you can:
It also seems like you will randomly regain them from leveling up your abilities again. Haven’t nailed down a pattern on that yet though 
It happens if you mine on the ceiling and if you go 2 blocks or deeper into the ceiling. (So that you have a one block wide hole in the ceiling with blocks on all 4 sides). The mined blocks seem to get stuck on the edge of the blocks around them although it should be a flat wall.
Kind of similar to the bug where you could walk on a flat wall on the edge of the blocks that made up that wall.
Not the best screenshot. I’ll try to take a better one later. But if you look closely you can see some mined coal floating in the ceiling without any reason.
If you have a smart stack of iron in the compactor machine, it can not be made into compacted iron item until the smart stack is separated into multiple individual stacks.
This thread is now closed. Please report all Testing releases in the Testing 23 support thread.
