Previex problem with the new masking tool

Hello,

I have a problem with the new masking tool.
I use the feature and when i select an object, it doesn't show the "red preview" ?
Anyone else have this problem ?

I've made the 5th november update and my config :

RAM : 32,0 Go
CPU : 12th Gen Intel(R) Core(TM) i7-1260P (2.10 GHz)
GPU : NVIDIA T550 Laptop GPU

Don't know if theses informations are the good one. Tell me if u need more