Line and Trail Renderers with "lit" materials are lit incorrectly in DirectX 12

Repro Steps:

1) Open project from command line with argument "-force-d3d12"
2) Open scene "LineRenderer" and play, observe all line renderers are mostly black
3) Open scene "TrailRenderer" and play, observe all trail renderers are mostly black

Expected: Line/Trail Renderers are lit
Actual: Lighting is wrong, they're all black

NB: Also happens in players forced into DX12.

Reproducible in 5.3.1p3, 5.3.4f1, 5.4.0b10