@Dave ***************
yes you are correct that Thailand can not control your home country asset distribution and vice versa.
But from my understanding is that thailand will reach out to your home country immediate family members for anyone to lay claim to your assets in thailand. Even if you have a will in thailand that says what is supposed to happen to them.
The few people I have talked to who have set up wills in country have been told to have a will in your home country to free any claim of assets you have in thailand, even if you have no assets in your home country. And that your home country will should be a part of and filed with your Thai will.