Although stated in the bug fixes, going through a nether portal in a world that was created in a pre release version ONLY (worlds created in snapshots seem to be fine) the game still gets the crash report

"The game crashed whilst ticking player

Error: java.lang.NullPointerException: Ticking player"

Also the "Affects Version/s" field didn't seem to have an option for the pre releases or snapshots so I just had to say 1.15 ------ Sorry I just found the issue and I will make a bug report with the correct field info