In snapshot 19w34a, when crossing a chunk border on a range of angles the chunk can unload before leaving your field of view.
Environment
Windows 10 Home 1809 build 17763.678
Java 8 update 211
MC-159492
Chunk unloads before leaving field of view
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue in MC-63020, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.