Hello! I was able to reproduce this, and addressed it in https://salsa.debian.org/mariadb-team/galera-4/-/commit/27a142792b5e02e66b8f1adf9a7b896c5722dd17 + added Salsa-CI testing for this specific scenario so that it would not regress again, but seems there is still some second scenario that does not upgrade properly.
I wish somebody could contribute with exact steps on how to reproduce the issue. So far I've gotten some half attempts at that but they haven't been actionable for me. My plan was to keep Galera-3 in Debian stable / Ubuntu stable as for the duration that MariaDB 10.3 is supported upstream, as MariaDB does not offer Galera by themselves, so it is better to have it available in distro. - Otto
