System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.92

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-01 20:37, hash: rB1d4bae856690
Worked: (newest version of Blender that worked as expected)

Short description of error
When you turn off bottom 'border collision' checkbox, the fluid still interacts with the border.

Exact steps for others to reproduce the error
create a cube.
Use quick effects fluid.
Set flow behavior of box to 'inflow'
Turn uncheck border collision bottom,
run simulation, see small ring form around stream at bottom.