Although I see that RC1 is not announced, I have tested the Fluxbox RC1s and I have seen this:
I don't know if it has to be like that, I ask... in Fluxbox (x32 and x64) the packages "mx-fluxbox-about and mxfb-art" are not installed.
In Fluxbox (x32 and x64) the installer does not pick up the change to dark mode with the "mx-confort-dark" theme that I do from the ISO-Live, I attach image.

In Fluxbox (x32 and x64) the "Mugshog" app runs at the same time with a terminal, I think that was only for the beta.
Regards