Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: AMD Radeon(TM) Vega 8 Graphics ATI Technologies Inc. 4.5.13558 Core Profile Context 26.20.11008.4009
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-11 18:41, hash: rBee5c2f6ead37
Short description of error
Vetex Group has more than assigned
Exact steps for others to reproduce the error
Select the cube.
Enter in to editmode.
Select 2 Faces that are opposite each other.
Make a vertex group.
Assign the selected Faces to a vertex group.
Click the select button on the Object Data Proprties panel.
Works also with all kinds of extruded shapes.
Here is an example shape.