This one: social.beaware.live/@BeAware/112...
Paste the URL into the search field on your instance and it should fetch it and then it should be visible as the parent of that comment - that's what I do to reply or like posts from other instances that I don't see on mineβ¦
I tagged @jglypt.co.uk there ([email protected]) to point out another case of Mastodon federation problems, and I accidentally managed to show him another federation problem because he also can't see the OP post on his instance π (I don't think mastodon.world is defederated? just no post there)