Edit it is sort of working now (bit of delay) (not sure if the webui subcribe button works still or was it lift acessing via lemmy api which got it to work)
Lemmy.world is also running 0.17.4, where a few federation issues were actually fixed in 0.18.0.
However, they held back upgrading, because captchas don't exist in 0.18.0, and actually attempted to upgrade to 0.18.1 which re-adds captchas. But- the upgrade was unsuccessful, so they rolled back to 0.17.4