Tested versions

4.4 dev5
Another regression from #97912

System information

W10

Issue description

Similar to #99221
When you set project's icon, it will be stored as UID. While it works fine in the editor, Project Manager is not able to load UIDs of projects, so it throws

ERROR: Condition "!unique_ids.has(p_id)" is true. Returning: String()
   at: ResourceUID::get_id_path (C:\godot_source\core/io/resource_uid.cpp:133)
ERROR: Error opening file ''.
   at: (C:\godot_source\core/io/image_loader.cpp:91)

and falls back to default icon.

It should be possible to read the UID from cache, but if it's not cached, there is no feasible way to load the icon.

Steps to reproduce

1. Open a project in Project Manager
2. In 4.4 dev5, set its application/config/icon
3. Go back to Project Manager

Minimal reproduction project (MRP)

N/A