Back again 30s later with another bug report, sorry lol. This one occurs when adding images to post text in piefed
Just to check on your home piefed instance try uploading a immage from web in a comment (or post body) not as post.
If the web ui gives u a markown for uploading images instead of usual select image then might be piefed issue.
I could be wrong though i have been using pifed for a day only.