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If the derailler is prevented from moving in its proper arc it can do this kind of thing. I found this out at the start of TCR last year. It shifted once and then failed to shift again. Seems it had slipped off the B-screw spring stop point when I first fitted it after the flight and then was in an odd position. Removed derailler, refitted it very carefully and it worked again.
If you push the button - does the derailer servo make noise?
hippy
LBS guy has no idea either. Says it looks like crash mode but it won't seem to come out of it. The mechanic with most experience of di2 is arriving soon so he'll have a go at it then. Stay tuned etc.