Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1060 3GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.86
Broken: version: 2.81 (sub 15), branch: master, commit date: 2019-10-21 18:07, hash: rB388c954cb537
Exact steps for others to reproduce the error
- Open file OverrideTestD which contains a linked collection with a library override from OverrideTestC
- Select one of the overrided collections in the outliner
- In the viewport add a new cube
- Save and reload, new added cube is gone.