devtrackers.gg
I have included a video of the bug:
Replication Steps:
- Use any block that features wooden supports
- Make your cursor's Y position is at least 18 and make sure you're in air mapping, grid mode
- Hold SPACEBAR and scroll all the way down to the ground
- Press CTRL+Z
Importance of this bug:
You can make a map that goes through these holes, validate it and reopen it in the editor, save it, and the map would be impossible to finish, since opening a map in the editor and not modifying anything doesn't invalidate it.