When an item is pinned from mini, its Share button is disabled. When the same item is pinned from the main app, its Share button is enabled.
The popout buttons are disabled on pinned items in either case, which is fine. I'm not sure why the popout buttons are present on pinned items at all, but that's not the end of the world.
1Password Version: 7.3.BETA-3
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided