STL not sliced in multi object (MMU2S) project

[drsp123]

Description of the bug

Context: 3mf file with 4 objects from Fusion 360. All objects overlap.

Action: Assign different extruder to each, slice

Expected result: 4 different objects print separately

Actual result: Only 3 objects are correctly sliced. (C letter missing)

Follow up step 1 - copy object that was not sliced and set one copy to negative volume. Slice again. Negative volume visible, but solid object not sliced (C letter missing, negative volume for C letter present).

Follow up step 2 - export object not slicing (C letter) as STL and then replace the object not slicing with the exported STL. Slice again, still missing object in G code.

Follow up step 3 - although no errors showing, try "fix object through netfabb" - no change.

Project file & How to reproduce

Disappearing STL.zip

Step to reproduce:

1. Open 3mf file
2. Note 4 objects with different extruders/colours
3. Hit slice
4. Observe "C letter" is missing from gcode preview 

Note that the "missing STL" (C letter) slices fine when not overlapping/intersecting with the "Lid" body

Checklist of files included above

• [X] Project file
• [X] Screenshot

Version of PrusaSlicer

2.5.0+win64

Operating system

Windows 11 Pro

Printer model

i3 Mk3S+ MMU2S

Update - RCA Confirmed as object name issue!!

To resolve this, I renamed the body in Fusion 360 and re-exported the 3mf file to Prusaslicer, which then correctly sliced the file. This seems related to naming the body with a space - but I have not exhausively tested to confirm what naming patterns work and which do not.

Working file: Top Lid Wood - FIXED.zip