With 1Password 6.5 BETA-22 (650022), OS X 10.11.6, I never seem to get automatic update notices or the updates themselves--I have to check manually and when I do I find out I have usually missed a couple of updates.
This has been happening for quite some time, maybe even with 10.10.
1Password Version: 6.5 BETA-22 (650022)
Extension Version: 4.5.9
OS Version: OS X 10.11.6
Sync Type: Not Provided