How to reproduce:
1. Load tester-submitted project
2. Open "Title Screen.unity" scene
3. Rotate the camera and stop when the white spot remains on the screen

Expected result: No white spots and black pixels appear
Actual result: When positioning camera in very peculiar angles white spots with black pixels appear

Notes:
* Main camera must have HDR allowed
* The scene must contain baked lighting (it doesn't matter whether the lightmaps are directional or non-directional)
* White spots are produced by Post-Processing stack plugin bloom effect (white spot is produced due to bloom effect being unable to determine the luminosity of the black pixel in the center of the spot)
* Black pixel persists through Unity scene grid (Editor view - possibly incorrect Z-Buffer pixel generated)
* Lightmap quality doesn't seem to affect artifacts
* Reproduces with both Directional and Non-Directional light maps
* Enlighten light mapper reproduces the issue too, but it's harder catch it

Reproducible with - 2017.3.0b1, 2017.3.1p1, 2018.1.0b8, 2018.2.0a1
Not reproducible with - 5.6.5p2, 2017.1.3p1, 2017.2.1p4, 2017.3.0a7