# When selecting multiply VFX game objects in the scene, it is impossible to toggle on/off the "Allow instancing" option in the game object's inspector. It has to be done per each game object individually one by one 
# When having a VFX inside a prefab, you can toggle on off the isntancing. When you go in the scene and want to apply the change to all the VFX using right click on the option, it is correctly diplasyed but does not seems to be correctly applied

Repro cases:

Issue 1
# Create a VFX and place it in the scene
# dupplicate multiple time the VFX, select all of them 
# try to click on the "allow instancing" toggle

happens: doesn't work 

expected: they all switch to the same value 

Issue 2:
# Create a VFX and an empty prefab 
# place the VFX inside the prefab and save the prefab 
# place the prefab multiple times in the scene (50 times sounds good)
# manually change instancing toggle value for all of them 
# do a perf test to check VFX perf 
# enter the prefab, change the "allow instancing" toggle and save the prefab 
# back in scene select all VFX, right click and "revert" on instancing: it resets to prefab value 
# do a perf test

expected: 

instancing change is applied, resulting in difference in performance between before and after change

happening:

perfs are the same: instancing was not applied