### Godot version

v4.0.beta14.official [28a24639c]

### System information

Windows 10, OpenGL

### Issue description

Vulkan and Mobile:
![Godot_v4 0-beta14_win64_kEcRNiMfNJ](https://user-images.githubusercontent.com/7782218/213967627-8e8755d9-2fe2-43b3-b197-f9f2840b7580.gif)

OpenGL:
![Godot_v4 0-beta14_win64_MQ233TZuPq](https://user-images.githubusercontent.com/7782218/213967651-ae463a6f-c867-4312-bdf1-525e1d7def01.gif)

At first I thought it was related to `set_buffer()`, but it turned out that `set_instance_*` also work incorrectly.
Probably the custom information is also set incorrectly, but I haven't checked it yet.

### Steps to reproduce

* Open MRP
* In the editor, select `MeshInstance3D` node and change the `Count` property
* -- or --
* Start the project and move the slider

You can also switch the renderer to Vulkan and compare.

### Minimal reproduction project

[set_buffer().zip](https://github.com/godotengine/godot/files/10476834/set_buffer.zip)

}
				attribs[i].type = GL_FLOAT;
				vertex_stride += attribs[i].size * sizeof(float);
				attribs[i].normalized = GL_FALSE;
			} break;
			case RS::ARRAY_NORMAL: {
				attribs[i].offset = vertex_stride;
				attribs[i].size = 2;
				attribs[i].type = (mis ? GL_FLOAT : GL_UNSIGNED_SHORT);
				vertex_stride += sizeof(uint16_t) * 2 * (mis ? 2 : 1);
				attribs[i].normalized = GL_TRUE;
			} break;
			case RS::ARRAY_TANGENT: {
				attribs[i].offset = vertex_stride;
				attribs[i].size = 2;
				attribs[i].type = (mis ? GL_FLOAT : GL_UNSIGNED_SHORT);
				vertex_stride += sizeof(uint16_t) * 2 * (mis ? 2 : 1);
				attribs[i].normalized = GL_TRUE;
			} break;
			case RS::ARRAY_COLOR: {
				attribs[i].offset = attributes_stride;
				attribs[i].size = 4;
				attribs[i].type = GL_UNSIGNED_BYTE;
				attributes_stride += 4;
				attribs[i].normalized = GL_TRUE;
			} break;
			case RS::ARRAY_TEX_UV: {
				attribs[i].offset = attributes_stride;
				attribs[i].size = 2;
				attribs[i].type = GL_FLOAT;