I see this error almost every time I open the comments on a post.
My server is lemm.ee. Does it not support the “mark as read” feature?
No problem! I had hoped to have API support updated before Lemmy 0.19.4 started deploying, but I missed the mark. I’ll push another update soon with support for the rest of the additions in 0.19.4, this seems to have been the only breaking change in this release.