Working on it, just dropped last whole version, this time things are much less messy, and easier on poor android thingy. If i get same error again i will post them.
Edit, got error again, this time opacity is zero ie invisible image.
Green image on left is old fashioned parameter in instanced material. Right one “empty box” is same material with collection parameters. Settings on right are exactly same, i copied left one widget and changed material only.
Parameter version of material
Collection version, you can see they are same and properly displayed in preview, same works also for instanced versions in preview.
values in collection.