"Save online" of some MuseScore V3 scores still doesn't work

This problem has existed for several months now, I wonder if it will ever get fixed?

I believe the problem is limited to MS V3 scores. I now have several scores which after upload are being processed for a very log time and eventually the link to the score will result in a "Page not found" message.
I've tried to export one of the scores to MusicXML and import it in MuseScore V2.
When uploaded the MS V2 version of the score is processed as expected and available. This is not a feasible workaround as quite some layout adjustments would need to be applied.