Solutions
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handycapp's post in Unraid 7.1.4 USB Flash drives changed because corrupted or offline message, simultaneously several array drives show read errors was marked as the answerOk, thanks Jorge.
Disk 13 mounted /x and browsable but no data actualy there as it never completed rebuilding the disk in the array due to the usb uasp driver issue.
Disk 6 mounted /x and was browsable with data as expected.
I will now execute the new config as suggested.
Cheers