Put the summary of the bug you're having here: In my world, on two of the levels of the minecart elevator, certain blocks keep disappearing. Specifically, the wool in the desert level and the wood planks, torch, and fences in the mineshaft level. Each one of the pictures that I attached shows either what it looks like with the bug (note that there may be more or less of the blocks missing, but that it's always in that spot) or what it looks like without the bug. Note that because both levels are enclosed, a lighting strike isn't a possibility.