Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.39
Broken: version: 2.80 (sub 74), branch: blender2.8, commit date: 2019-06-30 15:32, hash: rB7c8bf77e1351
Short description of error
When using the make instance real function the hierarchy of the objects gets lost even if the keep hierarchy option is ticked which affects both the grouping of the objects inside the original collection as well as any object parenting that is involved in the collection.
Exact steps for others to reproduce the error
In the uploaded blender file execute the "Make Instance Real" operation and ensure "Keep Hierarchy" is ticked.