Custom MUD MASK not working

Version: SU4

Frequency: Consistently

Severity: Medium
(Low - quality of life, workflow optimization, rare enough to not impact production, etc…
High - critical but workarounds are available, important feature not working as expected, frequent enough to impact production
Blocker - prevents from working on the project, prevents from releasing the product)

Marketplace package name: if applicable

Context: What package? When editing or mounted from Community? In main menu or in flight? etc…

Similar MSFS 2020 issue: insert url here if applicable

Bug description: For my aircraft I have set up a custom mud texture that has been implemented via decal meshes and the required xml entry. I can change the opacity of the texture via the debug slider but I would prefer the mud to appear in pieces like with the default textures. Therefore I have created a greyscale mud mask. When trying to add this custom mud mask for this texture there is no rendering diffference. Is it even possible to create a custom mud mask and if so, how does it need to be exported?

Repro steps:

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