Simple Baker problem with alpha channel

Hi everyone
I started tutor VAT PAINTSPLAT by Partikel and I have an issue with Simple Baker, it doesn’t bake the alpha channel

How it looks in tutorial

I use Houdini Apprentice 18.0.287
SideFX Labs 317

Has anyone run into the same problem? Any idea how to fix this?

what does your texture look like after baking it?

After applying material in UE4: