Hi @johns_scrobbler,
I'm on CachyOS and experiencing the exact same issue.
Scrobbling from Strawberry up to Last.fm works fine for me as well. However, whenever I listen to music on my phone or other devices and want to pull those play counts back into Strawberry, I can't do it because the sync button is no longer available.
It seems two-way fetching/importing is currently unavailable or missing in the newer versions. Hopefully, the developers can bring this feature back soon!