Channel usage when creating Painter filters seems broken

Hello,

I'm having trouble using any painter channels within a 'specific filter'
(https://helpx.adobe.com/substance-3d-painter/content/creating-custom-effects/channel-specific-filter.html )
For anything I try, not the channel in Painter but the inputs default value in the designer graph is used.

I wanted to use the user channels initially but failing that I tried to simply make the 
Specific Filter - Painter sample work, but here the same thing happens.

This the small modification I made to the sample, using the roughness channel to blend the base color with noise):

sebastian_8684_0-1769505794251.png

Roughness channel:

sebastian_8684_1-1769505945540.png

Result (should use roughness but uses white value from graph):

sebastian_8684_2-1769506007416.png

I checked with others who experienced the same issue. It might still be a user error, but if it is, it might be good to make it more obvious that something is wrong 🙂

This is using the latest designer and painter versions:

Substance 3D Painter, version 11.1.2
Build 5115 - 5faba39802156445fcb0e2b9673b9805f16bd435

15.1.1 build 10305 commit 12408c79 Release (01/15/2026)

Thanks so much for any pointers!

Seb