I just tested Release 1.13.1 and it seems, the issue with the duplicates-issues from #1200 are solved. But what I observed is, that the describedby is not resetted or removed, when errormessage has been cleared. So for my case, aria-describedby is added to link the errormessage, but it remains there forever, even if field is valid afterwards and the related id even does not exist anymore.
This is wrong, as the aria-attributes then points to a non-existing id, which is probably not accessible.