Previex problem with the new masking tool

[404prd]

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

[Ann Bens]

OS and exact Premiere version and build.

[404prd]

Sorry for late. 

It works now 
I'm on Windows and Premier Beta v26.0.0.30
I achieved to use the New masking object tool (it appear 1 times on 2) but now i have the "Project seems to be damaged and can't be open"