### Tested versions

Reproductible in 4.2 stable
Not reproductible in 4.1.3 stable

### System information

Godot v4.2.stable - Windows 10.0.19045 - Vulkan (Mobile) - dedicated NVIDIA GeForce GTX 650 Ti (NVIDIA; 30.0.14.7444) - AMD Ryzen 5 3600 6-Core Processor (12 Threads)

### Issue description

Reflection probes simply don't work on Vulkan mobile and Compatibility renderer.
Godot 4.1.3:
![image](https://github.com/godotengine/godot/assets/25274301/80ccb23c-8986-4662-a5e6-9846c361febe)
Godot 4.2:
![image](https://github.com/godotengine/godot/assets/25274301/f0fd93b0-a912-4f14-aa24-0cf6353c4484)

### Steps to reproduce

1. Create a sphere with a metallic material with low roughness.
2. Create some geometry to reflect off of the sphere
3. Add a reflection probe to the scene

### Minimal reproduction project (MRP)

[ReflectionProbes.zip](https://github.com/godotengine/godot/files/13592653/ReflectionProbes.zip)

directional_shadow.light_count = p_count;
	directional_shadow.current_light = 0;
}
static Rect2i _get_directional_shadow_rect(int p_size, int p_shadow_count, int p_shadow_index) {
	int split_h = 1;
	int split_v = 1;
	while (split_h * split_v < p_shadow_count) {
		if (split_h == split_v) {
			split_h <<= 1;
		} else {
			split_v <<= 1;
		}
	}
	Rect2i rect(0, 0, p_size, p_size);
	rect.size.width /= split_h;
	rect.size.height /= split_v;
	rect.position.x = rect.size.width * (p_shadow_index % split_h);
	rect.position.y = rect.size.height * (p_shadow_index / split_h);
	return rect;
}
Rect2i LightStorage::get_directional_shadow_rect() {