At the end of the day, this error vanished today and m command is working today.
Maybe only the developer can tell the story about this changes and why Merge shows another result today 
But it is as it is now and i just use View today… even when i think that View should replaced with Edit, at least this was my decission why i pressed Merge instead View in the past, because it looked identical and i was think at this time: Why in hell should i just View a pacnew view, when i want to change it?
And because it looks identical, i was thinking maybe there was some invisible background magic that im not aware about it. 