This is a deja-vu harking back to the more intimate three-per-room accommodation scheme implemented at the beginning of COVID quarantining.
Unless I have gone into another zone, I believe it was reported that one Thai returnee had a most shockingly unfortunate lunge at an open window in his room ... and succeeded ...
I left BKK roughly two weeks ago on Cathay Pacific (CX), transitting in HKG.
Not the tiniest inconvenience whatsoever in both airports.
No COVID-related info was asked of me ... let alone any need for document proof.
If your transit period is long and overnight, you can ask the soul-warmingly professional FAs for extra meals. (One FA offered me two extra Chinese-styled chicken buns pro-actively.)
I had Thai instant noodles and powdered coffee in my carry-on and simply *borrowed* a bowl from a shop counter that had closed for the night at the food court.
Hot water is available from three-temperature fountain machines at several locations on an upper departure floor. (The two at Gate #26 are the most popular & offer paper cups as well!)
If you wish to buy things, keep in mind that Hong Kong is an expensive city. (I saw one HSBC ATM & one Citibank ATM across from the food court.)
You can ask to your (dim-sum) heart's content at the 24-hour Information Desk marked by a big I.
PS: In BKK, I showed my brand-new, stamp-less passport (issued by my destination country) at the check-in counter. This baffled the CX agent, so I pulled out my useful US passport for her to confirm my entry stamp. From start to finish, she was professional, courteous and classy -- effortlessly drawing a smirk from the face of an ultra-discriminating Richard Barrow (no less), had he been in my shoes, of course. What was there not to like ... when I had the entire CX bank of counters to myself two hours before departure time?!
I beg your pardon ... your girl Narumon always looked ghastly in every Bangkok Post photo. Is she trying to pass for a geisha with a PhD in statistics?