I’m fairly new to lemmy and have a handful of accounts on a handful of instances and I use a handful of clients because I’m still trying to find one that comes close to the UX I’m hoping to get at some point. I’m mentioning that in case it’s confusing the whole situation.

My most used client is Avelon, and I have both a lemmy.world and a sh.itjust.works account (different names) on the client. I am still seeing lemmygrad posts show up, as well as content from their user base.

Is it because it takes time for the change to cascade through, or does defederation of instance Y not actually mean that a user of instance X will stop seeing content published to or by Y accounts?