For example this comment: https://lemmy.sdf.org/comment/984558 and this post: https://lemmy.sdf.org/post/873681 I both deleted, however from other instances they still appear to be there.

In case of the post others can still interact with it (comment and vote) except me, OP. In case of the comment, it just keeps the original text instead of deleted by creator, it can be interacted with, but it is also accessible to me as OP.

This is how the comment and the post appear from lemmy.ml. Still there, alive.

Edit: As per other lemmy user, this is already a known bug: https://github.com/LemmyNet/lemmy/issues/3588
The comment: https://lemm.ee/comment/1133649