Custom parameter groups not showing in Material Instance (UE5) (Groups in material expression)

Development Asset Creation
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Hi everyone,

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I’m following a tutorial and creating a water material in UE5 and created several custom parameter groups for my material expressions.
In the Material Editor everything looks fine, but when I open the Material Instance, in the Details panel I only see the default groups (Detail Normal Settings, General Foam, etc.). My custom groups are missing.

Here is what I’ve tried:

  • Created Scalar and Vector Parameters and assigned them to custom groups in the parent material.
  • Connected them properly into the material graph (not just left unconnected).
  • Saved and compiled the material.
  • Created a new Material Instance.

Still, only the default groups show up in the instance, my custom ones do not.

Question:
What am I missing? Do custom groups only appear under certain conditions in Material Instances? How can I make my own parameter groups visible in the Details panel?

Thanks in advance!