I am sitting in the TK lounge at BKK now. I am on my way to PNH using TK then Bangkok Airways. Transit is allowed and it does say so on the IATA web site. We were met as we left the nearly empty aircraft. Those that were entering Thailand had to show their Thaipass, the rest showed passport/boarding pass and were given a sticker to wear saying the destination airport. For my flight there were transit passengers for PNH and Sydney. We were then escorted as a PNH group through the transit security and on to the D gates. I will be doing the reverse next week. PCR tests and insurance were checked at LGW and IST, but no checks here for transit passengers.
I am looking at the flight information screens and the majority of flights are showing as cancelled.