UnsafeUtility.AlignOf<T> calculates the alignment of explicitly laid-out structs incorrectly when using structs containing fixed-size buffers or single fields with padding

How to reproduce:
1. Open the “IN-102034_repro“ project
2. In the menu, select Window → General → Test Runner
3. Press Run All

Expected result: All tests pass
Actual result: Two tests fail

Reproducible with: 2021.3.52f1, 2022.3.62f1, 6000.0.50f1, 6000.1.5f1, 6000.2.0b3

Reproducible on: Windows 10, macOS 15.4.1
Not reproducible on: No other environment tested

Notes:

• Reproduces when running the tests in Edit Mode, Play Mode, and Player
• Similar to an existing issue, however, not the same