I complained about it several times to various instances admins. Screenshot from same thread. I have literally been cursed out, called "stupid," "c***,” "b****,” and other unsavory slurs. I quit complaining because nothing was ever done, and I realize this is a free service offered and admins have lives, jobs, and plenty of work and expense by generously offering this service. I just thought it was worth another try.
Thank you
https://imgshare.cc/hw1e589o from the same thread.
Crosspost, obviously

If any Lemmy devs look here, Mbin adds the image to the attachments array and uses a custom property (source) to add the url directly to the post instead of url (in addition to the entry in the attachments array which Mbin adds too). I don't know how you're getting the url, but I assume one of those two is the issue. Both can be fixed by the Mbin devs imo, but if the attachment array contents are the issue, I do recommend making Lemmy more robust there as the problem won't end with Mbin in the future. Other projects might also add additional objects to that array.