[BUG] Adding people in a group from Nextcloud (TbSync) missing addresses after edit

[limatus]

Dear developers, foremost, thank you for the work!

I discovered a small issue, that leads to lists with gaps in the contacts. If I take a look at the overview, all needed addresses are listed in the categories the Manager discovered from our Nextcloud. After I add the contacts, interestingly, one address is missing.

It's a bit weird that might be very specific, but an annoying little bug.

If more information is needed, I am happy to provide screenshots, etc.