### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Compatibility) - Mesa Intel(R) HD Graphics 520 (SKL GT2) () - Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz (4 Threads)

### Issue description

After right clicking in thet "Filter Nodes" menu in the scene tree dock, the sub-menu is populated with a "Search" icon.

If I later switch themes in the same session, this icon is never updated to match the new theme.

![image](https://github.com/godotengine/godot/assets/660911/14336bb3-12ca-48c8-b030-8ada6ac27ec6)


### Steps to reproduce

1. Right click in the "Filter Nodes" menu in scene tree dock
2. Switch themes
3. Right click again in the "Filter Nodes" menu

Expected result: Icon has updated to match the theme I am currently using
Actual result: Icon is still using the theme I launched Godot with

### Minimal reproduction project

N/A
if (!p_node->get_owner()) {
		return false;
	}
	if (p_node->get_owner() != EditorNode::get_singleton()->get_edited_scene() && !EditorNode::get_singleton()->get_edited_scene()->is_editable_instance(p_node->get_owner())) {
		return false;
	}
	return true;
}
static bool _has_visible_children(Node *p_node) {
	bool collapsed = p_node->is_displayed_folded();
	if (collapsed) {
		return false;
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *child = p_node->get_child(i);
		if (!_is_node_visible(child)) {
			continue;
		}
		return true;
	}
	return false;
}
void SceneTreeDock::_normalize_drop(Node *&to_node, int &to_pos, int p_type) {
	to_pos = -1;
	if (p_type == -1) {
		
		if (to_node == EditorNode::get_singleton()->get_edited_scene()) {
			to_node = nullptr;