[ELP]

"I don't think this affects the real sampling rate of the project"

It affects the Sampling Rate at the Devise

Project-Tabs with different Sampling Rates.

I can see at the RME Settings, that the Sampling Rate does not change,
if i switch between the Project Tabs which has per Default Project Settings fix different Sampling Rates.
The Devise Sampling Rate stays at the last viewed open project settings page rate.

That should not happen.
If I set a fix Sampling Rate at the Project Settings,
the Sampling Rate at the Device should change
and not only if I tab between the projects and always have to go to the Project Page first.
Or if i have any of the close audio device settings enable.
After close and reopen the devise, the Sampling Rate for the Project also switch at the devise.
But not if i only tab between different projects and the Devise stays open.

Confirmed.

Edit:
mmmh But it can also a little be problematic (with switching between project tabs and different fix sample rates and the devise rate) with run background things. etc.pp

So I thing it is not really one bug, it is more an compromise to maybe avoid clicks/pops
underruns with|after only switching between the project tabs.