Minecraft wiki entry for Development_versions, associated text: MC-40380 – Replacing heads still drop as an item
MC-129433 – /locate Village doesn't work in superflat worlds
MC-131749 – Strongholds don't generate in superflat with the 'stronghold' generator option
MC-134849 – Mouse jitters with VSync in fullscreen
MC-136902 – Monuments do not generate when upgrading world from 1.7.10 to 1.13.1