syntactic analysis - Can one say "SOMETHING what is the X [...]", or must one say "SOMETHING what the X is"

I have always considered a sentence like "Let's check what is the best solution", or "I can tell you what is the best thing about this place" to be grammatically wrong, and would opt instead to "Let's check what the best solution is" and "I can tell you what the best thing about this place is".

Lately I'm noticing quite a lot of native English speakers use the latter format, and I'm not entirely sure whether they're making a mistake, or rather whether this is simply a preference of mine.