@Henrik ***
as far entry stuff due to covid, it doesn't matter the visa or how long you are gone. You will need to quarantine or participate in the sandbox. Covid tests, insurance, blah blah blah.
Prior Oct 1, you had to be in a low or medium risk level country for 21 days to be allowed in sandbox... Which excludes thailand. The rules changed a bit October 1..but check if you can participate if you only left for only 7 to 14 days.