### Godot version

4.2.dev3

### System information

Godot v4.2.dev3 - Arch Linux #0~20230811.g489fabdc SMP PREEMPT_DYNAMIC Sat Aug 12 02:04:20 UT - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1650 (nvidia; 535.98) - Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz (8 Threads)

### Issue description

After turning on 2d hdr and font msdf at the same time, there is a problem with ui text rendering.

2d hdr off:
![图片](https://github.com/godotengine/godot/assets/52148221/37074fde-a0ce-4d3f-8bfc-dcf3f910cb12)
2d hdr on:
![图片](https://github.com/godotengine/godot/assets/52148221/b858899c-e08f-4bac-b0d6-4385d9a46114)


### Steps to reproduce

1. Open msdf for default font or custom font.
2. Turn on 2d hdr.
3. Add a Label node and enter text, the text rendering is destroyed.

### Minimal reproduction project

N/A
} else {
				back_buffer_rect = ci->copy_back_buffer->rect;
			}
		}
		RID material = ci->material_owner == nullptr ? ci->material : ci->material_owner->material;
		if (material.is_valid()) {
			CanvasMaterialData *md = static_cast<CanvasMaterialData *>(material_storage->material_get_data(material, RendererRD::MaterialStorage::SHADER_TYPE_2D));
			if (md && md->shader_data->valid) {
				if (md->shader_data->uses_screen_texture && canvas_group_owner == nullptr) {
					if (!material_screen_texture_cached) {
						backbuffer_copy = true;
						back_buffer_rect = Rect2();
						backbuffer_gen_mipmaps = md->shader_data->uses_screen_texture_mipmaps;
					} else if (!material_screen_texture_mipmaps_cached) {
						backbuffer_gen_mipmaps = md->shader_data->uses_screen_texture_mipmaps;
					}
				}
				if (md->shader_data->uses_sdf) {
					r_sdf_used = true;
				}
				if (md->shader_data->uses_time) {
					time_used = true;
				}
			}
		}
		if (ci->skeleton.is_valid()) {
			const Item::Command *c = ci->commands;
			while (c) {
				if (c->type == Item::Command::TYPE_MESH) {
					const Item::CommandMesh *cm = static_cast<const Item::CommandMesh *>(c);