Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-06-18 21:33, hash: `rBf9aea19d9890`
**Short description of error**
I have a foreground grease pencil object, and a background grease pencil object (yellow blob).
The foreground object contains a layer set to 0 opacity.
Where this layer overlaps the background object in the viewport, the background object is invisible.
Expected behaviour: the visibility of the background grease pencil object isn't affected by transparent layers in a foreground object.
**Exact steps for others to reproduce the error**
Foreground object "makes hole" in background, doesn't blend. Rotate viewport camera, suddenly it blends correctly.
When foreground location is set to 0,0,0 it blends correctly too.