Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.20
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-13 17:12, hash: rBc56526d8b68a
Short description of error
As title says. Here video and file. Also, as far as we can use inner HDRIs for preview and rendering, they should be visible for reflection planes, cubemap baking etc. In 2.81a reflection plane is hidden, when scene`s world is off and default hdri is on.
Exact steps for others to reproduce the error
Add reflection plane in Eevee, check «show preview» in viewport vizibility.