The OnePlus 7 and OnePlus 7T series now receive the OxygenOS Open Beta 14 and 4 respectively. Although the build numbers for the phones in both series are different, the change log is similar.
The update fixes missing contact issues, voice input issues, and more.
OxygenOS Open Beta 14/4 Official change log for OnePlus 7 / 7T Series
- Fixed an issue where some software voice prompts could not be recognized.
- Fixed issue with contacts disappearing in address book on some devices.
- More options for the clock style are now available in the environment display (Settings – Customization – Clock Style)
- Improved system stability and general problems fixed
- Updated Android security patch to 2020.05
- Now you can view the call recording in the call list (Go to the call list and click on the three-dot menu in the top right to access the call recording.)
Source: Oneplus Forum