[Cura 5.7.0 won't slice a model that fits on the Ender 3 Max Neo build plate/says its too big]

I removed 5.7.0 and all its data files including the ones under AppDate then installed 5.7.1  It still won't accept the file at 100%.  If I try to scale down from 100% to 99% it won't work. But if I scale it down to 95% then scale it up one percent at a time I can get it to 99% but not 100%. 

[Cura 5.7.0 won't slice a model that fits on the Ender 3 Max Neo build plate/says its too big]

I am using 5.7.0.  I'll try 5.7.1   Thanks!

[Cura 5.7.0 won't slice a model that fits on the Ender 3 Max Neo build plate/says its too big]

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