Build fails in U6

Steps to reproduce:

1. Ensure IL2CPP module is installed in your editor.
2. Create a new 2D URP project, import Lost Crypt.
3. Build & Run.

Actual results: Error appears:

Assets\Settings\SpritePostProcessor.cs(4,36): error CS0246: The type or namespace name 'AssetPostprocessor' could not be found (are you missing a using directive or an assembly reference?)

 Can't copy more details, domain reloads and clears the console before it is possible. ([Internal link])

Expected results: Build has no issues.

Reproducible with versions: 6000.1.0a9, 6000.0.30f1, 6000.0.22f1

Not reproducible with versions: 6000.0.21f1, 2022.3.54f1

Tested on (OS): Win 10 primarily, also confirmed on Win 11

Notes:

• Build and run was done on the Windows platform.
• Same error and FAV as [Internal link]