Hi! Thanks for reporting this and Bug#1140296.
There has been several attampts to get the multi-arch right for theae packages, but it yas always run into some issues/conflicts. Thanks for investigating, perhaps we het the final version engineered now. I have this on my TODO but if you have a clear vision on how to solve it, feel free to post a Merge Request at https://salsa.debian.org/mariadb-team/mariadb-server/-/merge_requests
