"Unmountable Boot Volume" mention after 22000-194 installatioin

I experienced 2 days of Windows 11 on my external Samsung T5 SSD boot device, then again appeared the msg on green screen "Unmountable boot device" and no possibility to boot.

Hopefully I had a second SSD Win 10 bootable. 

I hope the official version of Win 11 will go OK AS THE OTHERS Windows versions, which gave no problem when upgrading.