Thank you, SiB. Tech support request created.
I am using a Tele2 SIM card at the moment. We found that in another LHG LTE with another Tele2 SIM card LTE Scan also does not find anything, but with a SIM card of another operator, LTE scanning works.
Later I will test with the SIM card of another operator. However, it’s not yet clear to me why there might be such a dependency.
I am using Tomato SIM card in Croatia on SXT LTE6 kit, scanner also shows nothing with current mikrotik release version, but in earlier versions it worked for me