Custom material makes disappear meshes

hey team,

I am trying to change a material on thinInstance using custom material atlas ( thanks to @Evgeni_Popov )

I need to have different colour on mesh, when I apply custom material, I could see the colour is changed, but some faces disappears, here PG

if comment line 74, you will see other meshes appears normally

what am I missing :?

figured, it were my normal issue, had to flip xD

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