Importing MIDI data from Addictive Drums 2 creates new MIDI track

This has been discussed previously on the forum but none of the solutions have solved it for me.

Using Artist 15.0.30

I drag a clip from AD2 into my instrument track. It lands on the instrument track, but a new (empty) MIDI track is created each time.

Last week I spent 10+ hours writing a couple of demos and experimenting with AD2, which is a recent addition. I’m 100% certain that this was not happening until now, so I guess I have accidentally changed a setting.

Time base is set to Musical on the track and on the Transport bar.

(I posted a screen recording on Youtube but can’t post the link - can share privately if it helps to see it)