I just ran into this trying to move data from a frozen account to an active subscription. Sharing is still possible via Item->Share, but the Right Click->Share option is gone. I know this is likely limited impact, but leaving the Share option in the Right Click menu would have saved at least one support ticket. ^-^ Let me know if you need screenshots.
1Password Version: 7.3.684
Extension Version: Not Provided
OS Version: Windows 10.1809
Sync Type: Not Provided