How to reproduce:
1. Create a new Unity project
2. Enable 'Maximize On Play' for the Game View
3. Enable Stats for Game View
4. Enter Play Mode
5. Enable VSync for Game View
6. Note that the framerate is synchronized
7. Pause and unpause Play Mode
8. See the framerate

Expected result: framerate remains synchronized
Actual result: although 'VSync' is still enabled, the framerate is not synchronized

Reproducible with: 2019.1.0a13, 2019.1.14f1, 2019.2.1f1, 2019.3.0a12
Not reproducible with: 2019.1.0a10, 2019.1.0a12
Could not test with: 2017.4.31f1, 2018.4.6f1, 2019.1.0a9(VSync toggle for Game View not available)

Notes:
Toggling VSync off and on again forces the framerate to be synchronized again