Crash - paint-on supports and reload from disk (2.7.1)

[the-ress]

Description of the bug

PS crashed when I tried to remove paint-on supports after reloading a STL from disk.

Crash dump: prusa-slicer.exe.23392.zip

Project file & How to reproduce

1. I had a model opened in PS and used 'paint-on supports' to block supports from a part of it
2. I made some tweaks in Fusion 360 and re-exported the model
3. I right-clicked the model and selected 'reload from disk' (the painting tool was still active)
4. The painted 'block supports' areas survived the reload (I expected them to be removed), but they didn't seem to affect the generated supports
5. I tried painting some more 'block supports' areas, but it was behaving weirdly
6. So I clicked 'remove all selection'
7. PS immediately crashed

Now that I think of it, the red 'block supports' areas might have had the shape of the model before reload.

project.zip

• yamaha hs logo cover v5-before.stl - original STL
• yamaha hs logo cover v5-after.stl - modified STL
• yamaha hs logo cover v5-before.3mf - project just before reloading
• yamaha hs logo cover v5-before.3mf - project after 'reload from disk' and painting some more supports-blocks

Checklist of files included above

• [x] Project file
• [x] Screenshot

Version of PrusaSlicer

Version 2.7.1+win64

Operating system

Windows 11 (22631.2787)

Printer model

Prusa MK4

[the-ress]

I think I managed to reproduce it: prusa-slicer.exe.27452.zip (This time it crashed during painting more supports after reload.)