I have noticed that many of the vinyl releases have Amazon ASIN URLs related to them that are for CDs. As I come across them I remove them and add appropriate cover art. There appears to be a bug that occurs when a removal edit for the ASIN is submitted prior to the cover art being added. When that removal edit is submitted first all attempts to add cover art result in the following at least temporarily....

<?xml version='1.0' encoding='UTF-8'?>
<Error><Code>SlowDown</Code><Message>Please reduce your request rate.</Message><Resource /><RequestId>e4cee4fd-73c9-4a78-a338-075e1e645a8d</RequestId></Error>

The functionality returns after a period of time which often lasts hours.