has anyone on MacOS installed digikam 9.1.0 with mariadb instead of SQLight?

I just installed a fresh new digikam 9.1.0 using the .pkg for MacOS (mac mini m4 on GoldenGate MacOS27.0), started to configure it, selected Internal mariadb, and got a failure to install error.

Is there any documented solution for this? I've kind of pieced together from various discussions that QT5 is still the robust solution, but that we need to move on to QT6, but that there is some error in older QT6, so moving to QT6.11 needs to happen, but that's something the digikam developers need to implement, not something an end user would do. ¯\_(ツ)_/¯

FWIW, I then started the installation over again and just chose the limited small-db "internal" default and digikam installed and runs. But I have MILLIONS of photos, so I think I need the full SQL database program (mariadb).