Federation problems with lemmy.world?

It seems my comments no longer federate to lemmy.world. I am wondering if anyone else has experienced the same.

I am not banned from the instance or it’s communities to the best of my knowledge- I’ve checked the modlogs from their instance directly and I do not appear. But every comment I’ve made since about 8pm UTC on Monday (the last known federated comment) has not federated. Just compare my user account’s activities between the two instances:
lemmy.world/u/empireOfLove@lemmy.one
lemmy.one/u/empireOfLove

They are still on 0.18.5 so is this a potential version mismatch bug between 0.19.0 and older instances? Content from their side is clearly still federating to us, as I see recent posts and try to interact with them, however nothing from our side seems to be federating to them.