Problem importing Timpani

I have a problem with importing MIDI to an existing Timpani staff.
If Timpani player is set to: “No key sig 1.10 octave”, it’s impossible to select it as a target for a MIDI track. It’s grayed out in MIDI Import Options. The only way around this is importing into a new Timpani player (the version with key signature) and then copy to the old staff. What am I missing?

I attach a sample project file.
Timpani.dorico (423.8 KB)

Can someone please verify if this is a bug or a user error?

I can’t say why it doesn’t work. But instead of copying after import, do a Change Instrument to the one with Key Sig. Then after import, do another Change Instrument to the one without. Much easier than copying.

Thanks @Craig_F. That’s a good idea, and much safer than copying.

I have this thread on my list of those to investigate, but haven’t yet had a chance to do so. I will come back to you as soon as I can.

I appreciate that. Thank you.