Seems there was more commits related to this in upstream recently: https://salsa.debian.org/mariadb-team/mariadb-server/-/commit/569039eb059c1861353251652486b5370b1a8ce2 https://salsa.debian.org/mariadb-team/mariadb-server/-/commit/649216e70d87c84b6c78e4cfb26c0afc96d5192e
Specifically the upstream commit 569039eb seems to fix the warnings emitted by missing _WSREP_START_POSITION, and thus this is now fixed in MariaDB 11.8.5.
