Black Textures in UI

Development Platform & Builds Mobile
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1

Hey,
I am cooking my android project with ETC1 and I am getting Black or Missing Textures for some of my UI elements. Some elements load correctly while others do not. All assets were created in Illustrator and exported as PNG.

Edit: With ETC2 more icons show up. But my health and ammo progress bar that uses image overlays is grayed out.

2

I think this might be a bug. The images display correctly on my newer LG phone but look gray on my older Nexus 5