Embedded images sometimes don't work, youtube links accidentally turn into pict.rs proxy links

I often find embedded images from other instances straight up don't appear, while embedded images from lemm.ee take a really long time to show up (and sometimes don't at all)

For example, the top comment here has an embedded image but it's not showing on lemm.ee: https://lemm.ee/post/38434336

An even weirder thing is that it thinks youtube links are also images, and tries caching them.