Channels aren't picked up in Substance Painter filter

It seems that using document channels in filters are broken - they are not picked up and the default value on the node is used instead.

Here I have started with the ‘Specific filter’ template and use the roughness channel as a mask for a blend:

In painter:
 

Applying the filter:

Using another texture works fine:

I was trying to use the user channels and not roughness but then I noticed that not even the default channels seem to work.


If this is a user error, please let me know! (if it is, it might make sense to raise a warning !!)

This is using the latest versions of Painter and designer

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

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

 
Thanks for looking into this,

seb