You know, it might be the '#blablabla' addition. It's probably not recognized as an image.
Discussion
nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z any chance Amethyst won't detect images if the url has trailing '#something'? You know, the separator for client-side additions to URL, similar to '?' for query-part.