after enabling fractional scaling you can even disable it again after plugging in the hub/second monitor (useful because it's blurry).
So my workaround looks like this:
boot -> freeze -> unplug hub -> enable fractional scaling -> plug hub in again -> disable fractional scaling -> adjust display arrangement -> work
additional observation: when the displays freeze the taskbar is cut off halfway, like it wouldn't fit completely on the screen.
after enabling fractional scaling you can even disable it again after plugging in the hub/second monitor (useful because it's blurry).
So my workaround looks like this:
boot -> freeze -> unplug hub -> enable fractional scaling -> plug hub in again -> disable fractional scaling -> adjust display arrangement -> work
additional observation: when the displays freeze the taskbar is cut off halfway, like it wouldn't fit completely on the screen.