I created two parts that were near the max X limit (setting is for Ender 3 Max Neo 300x300) and the slicer won't accept it.
The original was 298mm in the X direction and 175mm in the Y direction that it wouldn't accept.so I reduced it down to 285mm and it still wouldn't accept it.
I then brought it down to 253mm, no luck. However, if I scale the 253 model in Cura to 95% it will slice.
The full size version slices with no problem in Creality Slicer and two others. The project I attached is the 253mm version.
Exhaust vent bottom modified.3mf