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