Bug Preset is link to PostProcessProfile

Hi, I have encountered a bug between the PostProcessProfile Asset and the Preset system, I have created a preset for a PostProcessProfile but it appears to retain a 'link' to the original asset.

If I modify the preset, the PostProcessProfile which i created the preset from is automatically updated with the new values, without re applying the preset. (it also affects any other preset created from the same asset)

I think it's a bug since the unity documentation clearly says : "When you change the properties in a Preset, your changes do not affect items you have already applied the Preset to. For example, if you apply a Preset for a Rigidbody component to a GameObject, and then edit the Preset, the settings in the Rigidbody component do not change."

Do you have any idea how to fix this?
Unity version is: 2020.3.42f1