### 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)

switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			_update_color();
		} break;
		case NOTIFICATION_THEME_CHANGED: {
			btn_pick->set_icon(theme_cache.screen_picker);
			_update_drop_down_arrow(btn_preset->is_pressed(), btn_preset);
			_update_drop_down_arrow(btn_recent_preset->is_pressed(), btn_recent_preset);
			btn_add_preset->set_icon(theme_cache.add_preset);
			btn_pick->set_custom_minimum_size(Size2(28 * theme_cache.base_scale, 0));
			btn_shape->set_custom_minimum_size(Size2(28 * theme_cache.base_scale, 0));
			btn_mode->set_custom_minimum_size(Size2(28 * theme_cache.base_scale, 0));
			uv_edit->set_custom_minimum_size(Size2(theme_cache.sv_width, theme_cache.sv_height));
			w_edit->set_custom_minimum_size(Size2(theme_cache.h_width, 0));
			wheel_edit->set_custom_minimum_size(Size2(theme_cache.sv_width, theme_cache.sv_height));