When viewing a scene in 3D orthographic view, the viewing angles at which the grid will be displayed are very narrow - much narrower than they used to be in 2019.3.0a9 or lower.

1. Open Unity 2019.3.0a10 or higher
2. Create a 3D project
3. In the scene view, switch to orthographic (iso) view
4. In the scene view, hold the right mouse button and obit the camera around

Expected Result:
The grid is displayed at similar viewing angles to those found in 2019.3.0a9 or lower.

Actual Result:
The grid is only displayed at very narrow viewing angles.

Tested on Windows.

Occurs on 2019.3.0a10

Does not occur on 2019.3.0a9