Materials in scene tree - puzzled..

[jhiker]

Here's an odd one.
This assembly has a front screen, a rear screen and some digits in the display.
I have applied 'glass' material to the front screen and an 'emissive' blue material to the rear screen. The digits are white paint.
Everything looks good.

If I double-click on the parts I can see the materials are what I expect (Material/Material2) though the part name looks odd.
If I look at the scene tree those parts do not have the correct materials applied to them.

I first noticed this when I created a material template generated from this model and applied it to a duplicate blank assembly and it did not apply those two particular materials.

Any thoughts please?