Answered by ZUPAN
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Aug. 26, 2019 09:48
Unfortunately, yes. As you can see, this portion of your itinerary:
Bangkok - Chengdu - Bangkok
Made you ineligible for any kind of visa free transit scheme because this is not treated as a transit because there is no third country. In other words, the immediate points before and after your Chinese destinations are in the same country and that is not allowed.