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There is no infinite loop.  If the dictionary is a string, it is simply skipped.  If all dictionaries are strings, than all elements of the *finite* list are skipped, and the function returns without posting anything.

So either the program hangs in the `post_comment_to_lemmy()` function, that we don't see in the question.  Or you are misinterpreting no log output or no posted comments from that function as hanging.

Some things in the first paragraph may sound strange — because the type annotations are incorrect.  Or the code is.  `comments` is annotated to be a list of dictionaries.  The code then tests the list elements if they are instances of `str` — which doesn't make sense because the annotation says there's just dictionaries at that level.

Type annotations make sense only if they are correct.  Wrong type annotations are worse than no annotations at all.