I have been in the end and in the nether, on both occasions the server kicked me out, in the nether it happened to me while I was adding a slice Map and while I was exploring with the atlas, and in the end while it was entering and it wouldn't let me enter the server.

log nether.log
log the end.txt

Fixed in the latest version:
-Map_Atlases 1.20 - 2.7.7