### Godot version

4.2.rc2 (1ba920fada9efc8c4476ded50fe673b8db541366)

### System information

Mageia 9 - Vulkan (Forward+) - dedicated AMD Radeon RX Vega M GL Graphics (RADV VEGAM) () - Intel(R) Core(TM) i7-8705G CPU @ 3.10GHz (8 Threads)

### Issue description

Passing `--rendering-method forward_plus` on the command line to a project configured with `gl_compatibility` as rendering method leads to a crash:
```
ERROR: Cannot instantiate RenderingDevice-based renderer with renderer type gl_compatibility
   at: RendererCompositorRD (./servers/rendering/renderer_rd/renderer_compositor_rd.cpp:321)
ERROR: Parameter "scene" is null.
   at: get_gi (./servers/rendering/renderer_rd/renderer_compositor_rd.h:112)

Thread 1 "godot-git" received signal SIGSEGV, Segmentation fault.
RendererSceneCull::set_scene_render (this=0xb65a410, p_scene_render=0x0) at ./servers/rendering/renderer_scene_cull.cpp:4140
4140            geometry_instance_pair_mask = scene_render->geometry_instance_get_pair_mask();
(gdb) bt
#0  RendererSceneCull::set_scene_render (this=0xb65a410, p_scene_render=0x0) at ./servers/rendering/renderer_scene_cull.cpp:4140
#1  0x00000000091d5a07 in RenderingServerDefault::RenderingServerDefault (this=0xb0e5450, p_create_thread=false) at ./servers/rendering/rendering_server_default.cpp:421
#2  0x000000000579194e in Main::setup2 () at main/main.cpp:2455
#3  0x00000000057900da in Main::setup (execpath=0x7fffffffda27 "/home/akien/.local/bin/godot-git", argc=2, argv=0x7fffffffd570, p_second_phase=true) at main/main.cpp:2184
#4  0x000000000570c3a5 in main (argc=3, argv=0x7fffffffd568) at platform/linuxbsd/godot_linuxbsd.cpp:62
```

This also seems reproducible in 4.1.3.

Likewise, passing `--rendering-driver vulkan`, or both (`rendering-method forward_plus --rendering-driver vulkan`) crashes similarly.

The issue also happens with `--rendering-method mobile`.

On the other hand, passing `--rendering-method gl_compatibility` and/or `--rendering-driver opengl3` to a RD-based project (`forward_plus` or `mobile`) works fine.

### Steps to reproduce

- Create new GL Compatibility project
- Run it from command line with `--rendering-method forward_plus`

### Minimal reproduction project

Happens in a brand new GL Compatibility project.
_find_and_save_edited_subresources(scene, processed, flags);
	for (int i = 0; i < scene->get_child_count(); i++) {
		Node *n = scene->get_child(i);
		if (n->get_owner() != editor_data.get_edited_scene_root()) {
			continue;
		}
		_save_edited_subresources(n, processed, flags);
	}
}
void EditorNode::_find_node_types(Node *p_node, int &count_2d, int &count_3d) {
	if (p_node->is_class("Viewport") || (p_node != editor_data.get_edited_scene_root() && p_node->get_owner() != editor_data.get_edited_scene_root())) {
		return;
	}
	if (p_node->is_class("CanvasItem")) {
		count_2d++;
	} else if (p_node->is_class("Node3D")) {
		count_3d++;
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		_find_node_types(p_node->get_child(i), count_2d, count_3d);
	}
}
void EditorNode::_save_scene_with_preview(String p_file, int p_idx) {
	EditorProgress save("save", TTR("Saving Scene"), 4);
	if (editor_data.get_edited_scene_root() != nullptr) {
		save.step(TTR("Analyzing"), 0);
		int c2d = 0;
		int c3d = 0;
		_find_node_types(editor_data.get_edited_scene_root(), c2d, c3d);
		save.step(TTR("Creating Thumbnail"), 1);