Yes indeed, many variegation in Anthurium is transient, perhaps that is why some are not as popular compared to variegated Philo (in my opinion though). I just lost an Anthurium vittarifolium this month with that transient variegation, but unsure whether I want to get another one of that at this moment
Here is another transient variegated Anthurium... it is a A. bonplandii hybrid
There are many stable form too, but it seems to be harder to get as the crave on aroid is still on the air.
Here is an A. andreanum,
This one is actually not so rare, since the variegation is genetically inherited through seeds, so there are stock that always circulating in the market, however it is a slow grower, It is an A. jenmanii, I think I will cut it, since I am not good in taking care of seedling.