I've encountered sync issues via 1Password Family where a change made in v7.6 on one MacBook Pro does not appear in v7.7 on a second MacBook Pro (both running 10.15.7). The change did appear in the iOS app. The change was performed yesterday.
Noting the discrepancy today in v7.7, I undid the change in v7.6 and then re-applied the change in v7.6 and the change then sync'd across to v7.7.
Please let me know if you require any other info to support troubleshooting and resolution.
1Password Version: 7.6 vs 7.7
Extension Version: Not Provided
OS Version: 10.15.7
Sync Type: 1PFamily account