NumberGroupSizes_Get_ReturnsExpected fails on macOS 26 Preview 3

[vcsjones]

This test fails on macOS 26 preview 3 (and also failed on preview 1 and 2):

Assert.Equal() Failure: Collections differ
Expected: [3]
Actual:   [3, 2]
              ↑ (pos 1)

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[davidnguyen-tech]

A similar issue was created for MacCatalyst: #118850

[tarekgh]

Should be fixed by #120546