ProjectSettings has_setting() does not work with feature tags overriden settings

[BimDav]

Godot version

3.4.2-stable, 4.0 alpha 2

System information

Windows 10

Issue description

ProjectSettings' has_setting() method returns false even when the setting is overriden using feature tags. This is inconsistent with get_setting(), which can return a non null value even when has_setting() returns false.

Steps to reproduce

Override a setting using feature tags, and test it using has_setting()

Minimal reproduction project

has_setting.zip

[akien-mga]

This is no longer "fixed" as #57972 is being reverted, but see my explanations there. I think this bug report misrepresented the problem, as the MRP is more complex than what is being discussed.

Here's a MRP which does not reproduce the described issue: feature_override_check.zip

So the issue is strictly plugin specific and related to the order of registration of the settings.