If it is the former, there is no need to apply for a new visa during this period.
If it is the latter, there is no need to apply for a new visa. You can apply for a re-entry visa at the Immigration Bureau of Thailand, the cost is about 1 100 baht, and it only takes one working day (sometimes even a few minutes). In this way, in a short time, you can go back and forth with a return visa without going back to China to apply for a visa.
Of course, it is worth noting that there are many kinds of endorsement, one is endorsement. You can apply according to your own needs. When you re-enter Thailand after obtaining a countersigned visa, you can use the countersigned visa number instead of the original visa number when filling in the entry form.