Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: rB5be9ef417703
Worked: (newest version of Blender that worked as expected)
Short description of error
I've been using a custom grease pencil brush. When I draw on blender 2.90 in front of a geometry it looks perfectly fine. But if I use it on Blender 2.91 or 2.91 I always get a strange white base color behind each stroke. It looks like if the transparency or the alpha on the brush it's not completely rendered in real time.
Exact steps for others to reproduce the error
I attached a file where you can compare the look on different Blender versions, it consist of several lines drawn on front of a cube, the custom brush I'm using it's also on the scene. It's very noticeable as soon as you continue drawing on that same layer.
Thanks in advance.