### Godot version

v4.0.beta.custom_build [291add339]

### System information

Windows 10, Forward+, NVIDIA GeForce GTX 1050 Ti (31.0.15.1694)

### Issue description

I was testing if #69669 was solved by #70418, which it seemed to be. However, I got a wall of errors at the same time.

In the minimal reproduction project below in this Issue, I get errors when instantiating many of the same `GPUParticle2D` scene. In my earlier Godot 4 build (v4.0.beta.custom_build [2a04b18d3]) I did not get any errors (but got the occasional artifact as was my original issue in #69669).

I suspect the PR #70418 solved the artifact, but possibly introduced new bugs. However, I have not specifically built Godot with, and without the PR in question.

I believe this is the start and end of the errors - after which they repeat.
![wall_of_errors](https://user-images.githubusercontent.com/10490534/209046500-9813150c-d6e4-4a11-8e62-79d370d07009.png)

### Steps to reproduce

- Create a GPUParticle2D scene
- Instantiate the scene several times
- Observe the debugger get flooded with errors

### Minimal reproduction project

This project only instantiates default GPUParticle2D scenes with a default particle material.
[GPU_Particle_Creation_Bug.zip](https://github.com/godotengine/godot/files/10283416/GPU_Particle_Creation_Bug.zip)

ERR_FAIL_COND(p_render_buffers.is_null());
	Ref<RenderBufferDataForwardClustered> rb_data = p_render_buffers->get_custom_data(RB_SCOPE_FORWARD_CLUSTERED);
	ERR_FAIL_COND(rb_data.is_null());
	if (rb_data->ss_effects_data.ssil.last_frame.is_valid()) {
		Size2i size = p_render_buffers->get_internal_size();
		RID texture = p_render_buffers->get_internal_texture();
		copy_effects->copy_to_rect(texture, rb_data->ss_effects_data.ssil.last_frame, Rect2i(0, 0, size.x, size.y));
		int width = size.x;
		int height = size.y;
		for (int i = 0; i < rb_data->ss_effects_data.ssil.last_frame_slices.size() - 1; i++) {
			width = MAX(1, width >> 1);
			height = MAX(1, height >> 1);
			copy_effects->make_mipmap(rb_data->ss_effects_data.ssil.last_frame_slices[i], rb_data->ss_effects_data.ssil.last_frame_slices[i + 1], Size2i(width, height));
		}
	}
}
void RenderForwardClustered::_pre_opaque_render(RenderDataRD *p_render_data, bool p_use_ssao, bool p_use_ssil, bool p_use_gi, const RID *p_normal_roughness_slices, RID p_voxel_gi_buffer) {