While playing im finding chunks that switched places, even though i could swear i saw them intact half an hour ago (did not reload the save in between). Lucky i often backup. Logs are attached. Its not a visual glitch, on restart they are still moved.
Environment
Minecraft 1.14.1 on Windows 7 PC
This issue is already known, see MC-150202. Feel free to add any details there if you think the report is missing something.