Thumbnails are broken in Reference Viewer

The thumbnails in the reference viewer are broken and do not reflect the thumbnails in the content browser.

This is a Regression from 4.14.3

Spoke with BenZ about his change to the Asset Registry, but this was not effected by that.

1. Open QAGame
2. Filter by Material
3. Right click any Material and select Reference Viewer

Result: The thumbnails are broken and do not reflect the asset

Expected Result: The thumbnails in the reference viewer reflects the thumbnails in the content browser

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