Cura when sliced not showing full object

[JAD319 0]

Im using Cura 4.13.0 when I slice an object the outer wall dissapear?

Im very confused as why this is happening.

 

see before and after pics for reference to problem

[Carbon 29]

You're using a 1.0mm nozzle, what is the wall thickness of the "missing" area?

 

[JAD319 0]

2mm

[GregValiant 1,455]

There are settings that can cause areas to "disappear".  If you post a 3mf Project File (File | Save Project) it would be very helpful.

Is the Outer Wall Inset = 0 ?

Is the Horizontal Expansion = OFF ?

If you try slicing with a smaller nozzle (or line width) - does that area slice?

Is the model watertight?