Thank you for the hint, Michael!

It seems to be the bug described here:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/946

Also our IT-department was able to provide a workaround.

We added a script in /etc/ppp/ip-up.d called 0001changeroutes. The content
is

#! /bin/sh -e
ip a del $PPP_LOCAL peer <public ip> dev ppp0

After making this script executable I was able to connect to the VPN again.

Best

Marcel

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