"All nationals, except Thai nationals, from mainland China, Hong Kong, Macau, Republic of Korea, Iran, Italy and those with a travel history to France, Spain, United States of America, Switzerland, Norway, Denmark, Netherlands, Sweden, United Kingdom, Ireland and Japan (risk areas: Hokkaido, Tokyo, Aichi, Wakayama, Kanagawa, Chiba, Okinawa, Kyoto and Osaka) within the past 14 days must comply and present the following documents at the airport before acceptance"
From Air Asia's website. Link:
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Seems as if you've been in Thailand(no travel history as per above), go to Myanmar and return back to Thailand before Sunday, you should, in theory, be allowed back in without a covid test or proof of insurance. I'll update this thread for anyone who's interested. Going to Yangon and back today.