Intermittent federation issues?

I've noticed that federation here can be unstable lately - sometimes my comments will federate, and sometimes it won't.

An example of a comment I recently made that has not federated:

• https://iusearchlinux.fyi/comment/2017031 (my comment)
• https://lemmy.world/comment/3163328 (parent comment)

An example of a comment I recently made that has federated:

• https://iusearchlinux.fyi/comment/2104278 (my comment from this domain)
• https://pawb.social/comment/2343226 (my comment from the remote domain)

Might want to check the logs in case something's up. I don't think it's to do with the backend or whichever version it's using.