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Boolean doesn't work
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Description

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce 820A/PCIe/SSE2 NVIDIA Corporation 4.4.0

Blender Version
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked: (newest version of Blender that worked as expected)

Short description of error
Exact Boolean doesn't work

Exact steps for others to reproduce the error
I built a simple mesh called "Wall" and apply boolean with "Cube".
Since it is "exact" boolean, I expect the cube would cut the bottom part of "Wall" despite cube is overlapped with wall.
However, the exact boolean cannot work.

Model:

Screeshot:


Event Timeline

This must be the result of some minor inaccuracies during modeling process because when I force the alignment of the two faces the boolean works.

@Howard Trickey (howardt), what do you think? Deserves an investigation?
Perhaps the values of the coordinates shown in the interface are somewhat misleading.

These floating-point precision issues are known. Closing as this is more a limitation as of right now.