I don't need to. There will be no yearly extension for $50 listed in it anyway. I guess you should read and work on your comprehension, before spreading misinformation. I have 6 yearly extensions from the Cambodian immigration in my passport, I very much know the process here.
A year visa for Cambodia isn't $50, but multiple of it, and a letter from an employer or a business registration as well. And an additional work permit for $180 is necessary as well, without that you won't get a yearly extension.
I wouldn't be sure that the Thai immigration knows the difference between Kosovo, Croatia, Serbia, Montenegro and North Macedonia.. I guess they'd just throw a dart at the map and send you where it lands.