Hi! Thanks for your detailed report.
I can't see anything related to Debian packaging and you seem to have hit a bug in mariadb-server and I suggest you to ask for help with upstream developers. I have searched a bit in upstream issue but I can't find an issue describing the exact same situation as yours. MDEV-25394 seems quite similar though: https://jira.mariadb.org/browse/MDEV-25394 If you can't find a similar issue, then I encourage you to create one and link this bug report to it (see "Setting Forwarded": https://www.debian.org/Bugs/Reporting) Thanks! -- Faustin
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