We are using simple post process material that fakes fog in the level. Everything was working fine in 4.21 but after upgrading to 4.22 fog is not rendered correctly on android devices, but it works in editor (Android ES2 preview). Looks like on phone it is drawn on screen instead in the world, although changing falloff settings do not affect how much screen space it takes.
I have been struggling with this for a while and completely ran out of ideas. Maybe it is just a bug or maybe there is a checkbox somewhere that will provide simple fix. I will be thankful for any ideas!