Steps to reproduce:

1. Open any Project and download the attached Unity Package
2. Open the Package Manager and click the "+" button in the top left corner of the Window
3. Select "Install Package from tarball..." and select the downloaded Unity Package
4. In the Package Manager select this Package and open the Samples tab, then download and import it into the Project
5. Observe the Console

OR

1. Create a Package from the Package Manager with a default Manifest
2. Export it
3. Add it to the Package Manager
4. Download and import the example Sample

Actual results: Error "Assets\Samples\test3\0.1.0\Example Sample\SampleExample.cs(25,13): error CS0103: The name 'Debug' does not exist in the current context" is logged in the Console

Expected results: When creating a custom Package with default fields the example Package's Sample is created without any errors

Reproducible with versions: 6000.3.3f1, 6000.4.0b4, 6000.5.0a4

Can’t test with versions: 6000.0.64f1, 6000.2.15f1 (No Package creation from PM)

Tested on (OS): Windows 11, macOS 15