Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 375.70
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: rB1b8d33b18c2f
Short description of error
Select hierarchy operation deselects objects and select only one hierarchy, only for active object/collection.
It is very confusing and make impossible to select content of 2+ collections (or parents) at once and operate with complex scenes and bunches of objects.