System Information
Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56

Blender Version
Broken: version: 2.81 (sub 8), branch: master, commit date: 2019-09-09 08:46, hash: rB98d3a16281b6

Short description of error
Hitting delete or x key on objects does nothing, but works with collections.
Even if I assign a shortcut for it.
May be it's a TODO though...

Exact steps for others to reproduce the error
Try to delete an object in the outliner with a key.