System Information
Operating system: Win10 Home-Intel i5-3470 CPU@3.20GHz
Graphics card: NVIDIA GT 710
Blender Version
Broken: version: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: 77d23b0bd76f, type: Release
Worked: Once, but I do not have the file anymore

Short description of error
I make 2 planes along z-axis and put a 3D object between (e.g. Suzanne) . When the alpha value of the front plane is 0, Suzanne is completely visible. Once alpha is >0, the background plane covers the 3D object. To me, this sounds similar to T67974.

Exact steps for others to reproduce the error

• In Grease Pencil, I add box A with alpha=1
• Go to object mode, add a monkey mesh, place it in front of the box A
• In draw mode I add box B (or circle), set alpha to 0.5 move box B in front of monkey
• Monkey disappears where ever box B is located behind monkey in camera view
• Setting alpha of box B to 0 makes monkey reappear completely

I have included the blend file.