Loving the Windows Hello implementation! I'm noticing that when I unlock 1Password Mini with Windows Hello, it recognizes me, requests that I press OK, and then it displays "Something went wrong. Please try again." and runs the Windows Hello dialog again. After this, it unlocks successfully, though the 1Password Mini window isn't in focus anymore so I have to click the icon again to bring it back.
Hopefully this helps!
1Password Version: 7.0.519
Extension Version: 22.214.171.124
OS Version: Windows 10 Version 1709 Build 16299.214
Sync Type: 1Password Account