It’s fixed. Now if you copy-paste/quote a optimized image in post then it will be converted to proper image markdown with original image URL. I think this will stop 75% optimized image urls usage.
Anyway if you explicitly copied a optimized image url (by right clicking) and used in a post (not html pasting) then it will not get converted. In this case we may need to replace it in cooked post process job. Similar issue will happen to optimized image url oneboxes too.
https://github.com/discourse/discourse/commit/7e4edcfae8a3c0e664b836ee7c5f28b47853a2f8