I added the crash report.
I saved the world on which it occured, but the zip is quite large (862mb). If asked I will upload it.
Edit; will try fix this myself by deleting chunks with latest chunky. These particular chunks seemed to have been re-generated (so they were corrupted?).
Just waiting in the chunks solved the issue. To do this, I increased the amount of ms a tick could last in the properties. Everything seems fine now.