Took me about an hour but I think I found the source of the issue:
What's happening is that if a relative path is detected in a markdown url, this code checks that the relative path prefix is there. I'm not really sure why this is the case. If I'm running Wordpres (I am) and upload images there, shouldn't I be able to use relative URLs without enforcing the relative_path?
(For my reference, the relative path is set based on the site url)
While unfortunate, the loss of OP content is still better than the entire topic being deleted
I believe Reddit follows the same philosophy
That makes sense. I think of a few scenarios where it would be acceptable and a good idea to have.