There appears to be a significant problem with WLAN synchronisation and this beta. I update items only on my MacBook Pro and use WLAN sync with my iPhone and iPad (both of which are running iOS 11.4.1 and 1Password 7.0.6). Although my iPhone just appeared to sync successfully 1Password 7 on my MacBook Pro has crashed repeatedly when trying, immediately afterwards, to sync with my iPad. (I have submitted the crash report.)
Further, having tried disabling WLAN sync on the MacBook Pro, deleting 1Password data on the iPad and re-syncing, the sync to the iPad never appears to end (the sync icon continues to spin). In addition, not all of my tags have sync'd to either my iPhone or my iPad (i.e., there are items with some of the MacBook Pro tags missing on both the iPhone and the iPad).
1Password Version: 7.1.BETA-0
Extension Version: 18.104.22.168
OS Version: macOS 10.13.6
Sync Type: WLAN