There seems to be that only at certain distances from the origin, the camera will render the 2D lights, but only in Game view or the Player.
In the Scene window, the lights behave well.

To reproduce this:
- download this project
- notice the point light in the Scene
- notice it won't show up in Game view
- if you move the camera past -13 on the Z axis, it will eventually show up
- I have had, though, a scene with many point lights where they will only show up at different depth values, and it was quite hard to get them to all show up at the same time.

Reproduced with both 2019.3.0a6 and 2019.2.0b6