Entering the End or the Nether after creating and reentering a debug world crashes the game

Regardless of whether you have entered the End or the Nether on your first entry on the debug world, reentering the debug world and using either the Nether or the End portal will crash the game.

 

Nether Crash Report: crash-2020-05-23_16.47.10-server.txt

End Crash Report: crash-2020-05-23_16.44.47-server.txt