Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86
Broken: version: 2.83.0, branch: master, commit date: 2020-06-03 14:38, hash: rB211b6c29f771
Worked: (newest version of Blender that worked as expected)
Short description of error
Compositing different sized scenes with grease pencil crushes blender.
For exmple, mixing two render layers in composite node, from Scene.A and Scene.B,
with different resolutions (640x360 and 960x540) crushes blender if active scene is Scene.A, smaller one.
If Scene.B is active, Grease pencil is composed strangely, as an image below.
Exact steps for others to reproduce the error
Open blender and make a new scene in addition to the default one.
(Rename Scene.A and Scene.B for simplicity)
Change the resolution of the scene.
(640x360 and 960x540, for example)
Set basic objects like camera and light for new secene.
Make grease pencil object and draw some strokes for both scene.
Open Compositor and enable composition node tree.
Make render layer from both scenes and mix them as an image below.
(Note that setting for for both scenes are needed.).
If active scene is Scene.A (smaller one), rendering crushes blender.
If active scene is Scene.B, grease pencil looks strangely.
The image looks as if that the size is evaluated wrongly.
I attacht simple .blend file with above setup.
render in Scane.A crushes blender (at least on my PC).
If grease pencil objects are removed, non-grease pencil object images are composed correctly