Weird issue adding spotify playlist


I’m having a weirg issue trying to add spotify playlist to mopidy through websocket. Json request looks like this


and response to this request looks like this

{"jsonrpc": "2.0", "id": "74fcff56-5255-41d8-9829-725695dbca52", "result": []}

When I add tracks from that playlist separately everything works ok, other playlists also work ok. In log I get error
’Operation did not complete in 10.000s’.
What could be the cause of this situation?

Edit: I also changed timeout setting in spotify extension but stil no change.