Fractional scaling factor isn't saved

Hi!

I tested the Ubuntu 21.10 beta from 2.10.2021 in VirtualBox.

I have a 4k display. With the monitor-size I need a scaling of the fonts, controls and all in 150%.

If I select as resolution 3840x2160 , activate fractional scaling and selection as scaling factor 150%, then all works fine.
But after every restart, all without the scaling factor will be correct.
The scaling factor is then again 100% and have to be changed after every restart.

So that information isn't be saved. Or it is saved, but not red at the start of the system.

Greetings
theuserbl