Asset Manager related warnings are thrown on each reimport

Steps to reproduce:

1. Create and open a new project
2. In Package Manager, install the Asset Manager package
3. Create a new Script file in the Project tab
4. Observe the Console

Actual results: 36 warnings similar to "The type Unity.AssetManager.Core.Editor Unity.AssetManager.Core.Editor.IOProxy is being serialized by [SerializeReference]" are thrown after script recompilation

Expected results: No warnings are thrown

Reproducible with versions: 1.10.0, 1.11.0 (6000.4.0a1, 6000.4.7f1)

Not reproducible with versions: 1.10.0, 1.11.0 (6000.3.0a6)

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• The regression is within the Editor versions