Pathtracers doesn't accumulate in play mode when the editor is out of focus.

It may be expected that the pathtracer pauses the accumulation process when the editor looses focus, even in play mode.
But when enabling "Play Unfocused" in the game view, I expect that everything continues running when out of focus, including pathtracer accumulation.

A fix for this could be done alongside the improvement of the pathtracer API : https://forum.unity.com/threads/manually-reset-path-tracer-sampling.1191007/#post-8333211

The issue might also happen in a build with Run In background enabled :