System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.48

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: (newest version of Blender that worked as expected)
unknown

Short description of error
[Please fill out a short description of the error here]
Smoke does not leave through open domain boundary

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

1. start blender
2. add fluid domain to default cube
3. add border collision to bottom
4. Change cache type to Modular
5. Change gas bouyancy density to 0 and Heat to 0
6. Add 0.5m mesh plane
7. add fluid->inflow to mesh plane
8. set inflow initial temperature to 0
9. enable initial velocity to mesh plane
10. set initial z-velocity to -1m/s
11. bake fluid domain
12. See how smoke is crawling up along side walls despite that border collision is not enable for these walls. I see this as a bug.