CinemachinePostProcessing component constantly disappearing on build / on duplicating cam

Exactly as the title says, we’re having tons of problems with the CinemachinePostProcessing component constantly disappearing when we play the game in the editor or we build it, or when we duplicate vcams in a scene. It also doesn’t have the script icon, which is a bit weird. Any idea why this happens, how to fix this?
Note that as far as I can see, we don’t have any old Cinemachinve Stack integration leftover, but we’re using only the CM package (that supposedly includes those scripts now).

In scene
5157659--510956--Cattura.PNG
When playing
5157659--510953--aaa.PNG

Yes it’s a known issue that’s been fixed. Upgrade your Cinemachine package to the latest 2.4.0 (in preview).

That sounds great, how safe is it to switch to 2.4.0 while in production? we’re using 2.3.4 now

Should be fine.