System Information
Operating system: MacOS 11.2 & WIN10
Graphics card: AMD Radeon Pro 5500M 8 GB & Quadro 1100

Blender Version
Broken: 2.92 & 2.93
Worked: 2.83.10

Short description of error
Doing a Full Copy of a scene

And changing an object's shader (for example) in the new scene, doesn't behave as expected (the shader is changed in both the original and the copied scene).
Exact steps for others to reproduce the error
. Use startup scene.
. Go in Shading Layout.
. Do a full copy of the scene.
. Change Cube object shader to Emission Shader.
. Switch back to original Scene. The Shader has changed there too!
In 2.92 & 2.93:

How it should behave (2.83):

Thanks!!