Chiang Mai’s stance is those guys are covered. They turned people away at the entrance that were coming to get their stamps, which, in most cases, would get them a stamped date BEFORE the 30th.
I cant say definitively, but I’d think they follow the same rules....roughly. Meaning you don’t have to do anything until the 30th, but keep eyes/ears open for the next step to take. Sorry I can’t be of any more help.
Relax and ride out the amnesty period until 30 April. More guidance will come out as we get closer to the end of the month. You are automatically extended until the 30th.