Operating system: Linux-5.3.5-arch1-1-ARCH-x86_64-with-arch 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: rBf61a8a2abd07
Worked: 2.80 (Release)
Short description of error
Cloth simulations that are reimported in to Blender via Alembic seem to ignore the shading type. (Smooth/Flat)
This used to work in 2.80 and got broken somewhere along the way.
Possibly related to: T69182
However, here the vertex count is not changing.
Exact steps for others to reproduce the error
See attached blendfile or import the attached ABC files and change the shading to smooth/flat. - The shading will change correctly on the left cube but not on the right cube which has the cloth sim.