error downloading images

[RyanGibb]

I can't view images with pantalaimon. I've tested this with ement.el and element desktop. In ement.el images in encrypted rooms are shown as [image] and link to a URL such as http://<pantalaimon address>:<pantalaimon port>/_matrix/media/r0/download/<homeserver>/<hash>. Navigating to this URL returns {"errcode":"M_UNKNOWN","error":"Internal server error"}. I've reproduced this in element where they show up as Error downloading image. For context see alphapapa/ement.el#284.