Clef reset after instrument change

I can’t reproduce this from scratch, but I submit it anyhow. Attached snippet comes from a friends XML or MIDI import, started long time ago in Finale. I wanted to change the Accordion into a proper Dorico accordion. That works, but the treble key in the lower staff is reset then to a bass clef.
Accordeon clefs disappear.dorico (1.4 MB)

That’s normal. Dorico Accordion is a grand staff instrument.

Just select the first rest in the lower staff and do shift-c g to change it to a treble clef.

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