@panos cross posts themselves are not federated out because there is no established standard or FEP that spells out how its done. (Not that that’s ever stopped me before… but I digress.)
When a user cross-posts a topic to another category it will federate out an “announce”, which looks like a boost on Mastodon.
I’ve put some of those checks in here for me to look at.
https://github.com/NodeBB/NodeBB/issues/13931
