Plane.GetHashCode returns different values when two Plane objects compare equal

How to reproduce:

1. Open the attached "IN-154868" project
2. In the menu bar, select "Tools" > "Bug Repros" > "Plane Equals and GetHashCode"
3. Observe the Console

Actual result: The Console shows "a.Equals(b): True", two different hash codes, and "HashSet containing a, Contains(b): False"
Expected result: The Console shows "a.Equals(b): True", two identical hash codes, and "HashSet containing a, Contains(b): True"

Reproducible with: 6000.3.0b10, 6000.3.26f1, 6000.6.6f1, 6000.7.0b5, 7000.0.0a9
Not reproducible with: 6000.0.85f1, 6000.3.0b9

Reproducible on: Windows 10 (by user), Windows 11 Enterprise (25H2)
Not reproducible on: No other environments tested

Workaround: Use a custom IEqualityComparer<Plane> that hashes the normal and distance the same way it compares them

Note: In 6000.0.85f1 and 6000.3.0b9 the Console shows "a.Equals(b): False", so Equals and GetHashCode agree there