### 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)

if (!c) {
		return;
	}
	PickerShapeType actual_shape = _get_actual_shape();
	if (p_which == 0) {
		Vector<Point2> points;
		Vector<Color> colors;
		Vector<Color> colors2;
		Color col = color;
		Vector2 center = c->get_size() / 2.0;
		switch (actual_shape) {