Oddly, the endpoint on lemm.el and lemmy.ml return comments:
> curl 'https://lemm.ee/api/v3/comment/list?post_id=45734814' | jq '.comments.[] | .comment.content[:50]'
"Yeah, you're right. I didn't read enough of the do"
"Thank you for the tip ... but whatever I try with "
"~~In 0.19.5, they removed the deprecated `post_id`"
> curl 'https://lemmy.ml/api/v3/comment/list?post_id=21766749' | jq '.comments.[] | .comment.content[:50]'
"Yeah, you're right. I didn't read enough of the do"
"Thank you for the tip ... but whatever I try with "
"~~In 0.19.5, they removed the deprecated `post_id`"
I think it would be better to ask the admin of the instance before creating the issue.
Yes, they started the restriction a year ago. For a future reference, here’s the announcement about the restriction (written in Japanese): https://support.misskey.io/hc/ja/articles/7604557294607