Operating system: Linux-4.4.0-176-lowlatency-x86_64-with-debian-stretch-sid 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Broken: version: 2.83 (sub 11), branch: master, commit date: 2020-03-31 23:07, hash: rBda3cb514e52d
Worked: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: rB375c7dc4caf4
Short description of error
In some cases GP objects looks blocky, like a low poly objects.
Exact steps for others to reproduce the error
Open attached file and render it.
Compare render result with previous worked blender version.