EditorUtility.DisplayDialog close button looks different from the standard Windows close button

Reproduction steps:
1. Open the user's attached project
2. Select Bug > Reproduce from the Menu bar
3. Close the first dialog window

Expected result: Both windows have the same close button
Actual result: The DisplayDialog window close button position and size are different from the MessageBox window

Reproducible with: 2019.4.33f1, 2020.3.24f1, 2021.2.5f1, 2022.1.0a16