requirement is still to overnight in BKK for 1 night,,theire should be an option to rebook your continuation flight a day or 2 later to Phuket in that airlines home site...normallt airlines will give you an option to rebook if they cancelled the flight in advance.or request a refund, and then rebook another option that works for you.
better yet, stop the nonsense with all these registration requirements, require Vaccination papers ok, the rest, forget it! I don't know of a single country right now participating with thise crap, and if they want millions to arrive like before, then that is the only solution.