The list has dwindled to a few, but there is one game I can't believe never got fixed for the XL OS. That title is Ghost Hunter which was an early, but decent Pacman knock-off. I believe it is the only simultaneous two player capable Pacman type game. It was one of the first games I bought on cassette for my 16K 400 in early 1982.
Beat me... my UltraEdit had expired so had to grab another hex editor.
The fix I found was to just change instruction at $A2D4 to a JMP $A2E5 - skips a loop that copies to the vector area @ $200.
I guess this was probably a diag mode cart originally, shows the dangers of doing software as such because you can't necessarily initialize the OS area in RAM and have it work on all OSes.
May as well include my Xex in case the xxl one is different and doesn't work:
K-Razy Kritters XL.xex