But I'm getting an error and I think the problem is that the post/comment was on a different Lemmy instance other than .world?
I think perhaps the SHARE option needs to pay attention to the instance too? (instead of just appending lemmy.world/comment to the front of the comment ID)
Doesn't seem to be an issue with different instances. This: https://lemmy.world/comment/2956912 ....is the link to a comment made by me, a lemmy.world user, ON lemmy.world, and I still get a blank page just like with your linked example.