Export stl does not contain added text

[m3cinc]

Description of the bug

generate text to modify a part

then export the file as stl
then open stl in slicer... no text !!!
cube_ver3.zip

Project file & How to reproduce

See attached project file and screenshot

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

2.6.0-alpha5+win64

Operating system

Windows 64bit

Printer model

mk3s+

[kubispe1]

At the moment negative volumes are denied export... So that's the reason. There is an "Original" thread of this issue. #8853
So I am closing it as duplicate