[Evolution] CalDav / CardDav problem out of backup

[Michael <dennismail gmx net>]

Hello there,

I am using evolution on different systems:

- ubuntu 18.08 with evolution 3.28.1-2
- fedora 28 with 3.28.5-1

But I was also facing the following problem when doing the described
steps between 2 ubuntus with same evolution.

What I am doing:

- exporting evolution settings with the integrated backup option
- importing the settings with the integrated restore option

Mails are working fine after that (I have to re-enter passwords, but
that's a different thing). But: Both the CalDav and CardDav I am using
on the backup side are not working on the restore side: I click on them
in the interface - but nothing happens. Even if I use the "refresh"
option, it only shows that there are not contacts/calendar entries to
be shown.

When I delete the two on the restore side and create a new connection
with the exact same settings, it suddenly shows the calendar/carddav
entries.

So my question: Is there a known bug in backup/restore concerning
carddav/caldav? Or what may be the reason why I am facing this?

Greets,
Michael