[Living] Placeholder contamination of trees

[DavidMStraub]

@emyoulation

It seems like the initial export from Gramps for Desktops (which is subsequently imported into GrampsWeb) has to be to source of the placeholders.

I agree that would explain it. Exporting an incomplete tree, importing it to Gramps Web, and then synchronizing is something I would also classify as a clear user error. We have to check how we can make our documentation even clearer to make it less likely.