### Godot version

v4.3.dev.custom_build [d76c1d0e5]

### System information

Linux

### Issue description

When opening the color picker by clicking on a color property the color changes slightly.

### Steps to reproduce

* Click on a property with value `Color(.5, .5, .5) ` in the inspector
* Click away
* Open the color picker again
* See the color change to Color(0.502, 0.502, 0.502) in the "RAW" tab

### Minimal reproduction project

[ColorChangeBug.zip](https://github.com/godotengine/godot/files/13545089/ColorChangeBug.zip)

ClassDB::bind_method(D_METHOD("set_pick_color", "color"), &ColorPickerButton::set_pick_color);
	ClassDB::bind_method(D_METHOD("get_pick_color"), &ColorPickerButton::get_pick_color);
	ClassDB::bind_method(D_METHOD("get_picker"), &ColorPickerButton::get_picker);
	ClassDB::bind_method(D_METHOD("get_popup"), &ColorPickerButton::get_popup);
	ClassDB::bind_method(D_METHOD("set_edit_alpha", "show"), &ColorPickerButton::set_edit_alpha);
	ClassDB::bind_method(D_METHOD("is_editing_alpha"), &ColorPickerButton::is_editing_alpha);
	ClassDB::bind_method(D_METHOD("_about_to_popup"), &ColorPickerButton::_about_to_popup);
	ADD_SIGNAL(MethodInfo("color_changed", PropertyInfo(Variant::COLOR, "color")));
	ADD_SIGNAL(MethodInfo("popup_closed"));
	ADD_SIGNAL(MethodInfo("picker_created"));
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "color"), "set_pick_color", "get_pick_color");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "edit_alpha"), "set_edit_alpha", "is_editing_alpha");
	BIND_THEME_ITEM_CUSTOM(Theme::DATA_TYPE_STYLEBOX, ColorPickerButton, normal_style, "normal");
	BIND_THEME_ITEM_CUSTOM(Theme::DATA_TYPE_ICON, ColorPickerButton, background_icon, "bg");
	BIND_THEME_ITEM_EXT(Theme::DATA_TYPE_ICON, ColorPickerButton, overbright_indicator, "overbright_indicator", "ColorPicker");
}
ColorPickerButton::ColorPickerButton(const String &p_text) :