PETG defaults to extruder one despite being set to head 5 as support

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Description of the bug

I am setting PETG as support on my 5th head on my Prusa XL. Despite it being set correctly in the slicer (multiple extruders, setting 5th head as support). Upon exporting, the export is PETG, PLA vs PLA, PETG (PLA being the main extruder, PETG as support)

Project file & How to reproduce

1. Go to a new project
2. Set PETG support to any extruder that is NOT the first head
3. Verify that support material is set to Extruder NOT the first head (in my case extruder 5)
4. Export, notice the file name lists it in the wrong order, printer says its wrong as well. Should be PETG last, lists PETG first.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

PrusaSlicer Version: 2.9.0

Operating system

Mac OS 15.2

Printer model

Prusa XL 5 head

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ThermalLabel.3mf.zip