Not sure what else to add to this ... The structure only had a couple layers of Birch Planks for a roof but the cave I dug out still had at least ten layers of stone above it.
Environment
Ubuntu 20.04, OpenJDK 11.0.7
MC-181573
Rain indoors
Resolved
Duplicate
0
This was fixed in 20w18a, however worlds opened in 20w17a will remain affected by this issue. You need to optimize the world and erase its cache. For instructions on how to do that, please look at the instructions from MC-179845.