Ahead of schedule, Google mistakenly started rolling out July 2019 Android security patch to some Pixel 3a units. Several users took to Reddit to share the experience of getting the July Security patch ahead of schedule. The update with the build PQ3B.190705.003 included July 5 Security Patch and weighed at 79.8 MB.
According to the sources, it appears to be the “Googler-only” build aimed for internal testing. It was scheduled to release precisely after ten days from now. These “dogfood” or “Googler-only” builds prerelease versions are not meant for public use. The images shared also depicts “Confidential Internal Only” heading, which confirms the mistaken rollout by Google.
Google rolls out the security patch update at the beginning of each month. It first sends the security patch to its hardware partners before the official rollout on Pixel devices.
As far as the changes are concerned, the new OTA update carries the latest security patch and general bugfixes. There are no significant changes as according to the changelog appeared along with the update.
However, this is not for the first time that Google made such a mistake. A similar update was rolled out for Google Pixel XL in 2017.