### Godot version

v4.0 rc6

### System information

Windows 10

### Issue description

When using a ViewportTexture from a SubViewport on a TextureRect, it throws errors after running the scene once and then switching scenes in the editor.
![Pasted image 20230227212626](https://user-images.githubusercontent.com/44676282/221680047-984fa03e-33d1-4856-9a7f-1700b28423cf.png)


### Steps to reproduce

Run the canvas-scene once.
Switch to another scene in the editor.
Switch back to the canvas-scene

### Minimal reproduction project

[ViewportTextureError.zip](https://github.com/godotengine/godot/files/10844099/ViewportTextureError.zip)

BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_256);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_1024);
	BIND_ENUM_CONSTANT(SHADOW_ATLAS_QUADRANT_SUBDIV_MAX);
	BIND_ENUM_CONSTANT(SCALING_3D_MODE_BILINEAR);
	BIND_ENUM_CONSTANT(SCALING_3D_MODE_FSR);
	BIND_ENUM_CONSTANT(SCALING_3D_MODE_MAX);
	BIND_ENUM_CONSTANT(MSAA_DISABLED);
	BIND_ENUM_CONSTANT(MSAA_2X);
	BIND_ENUM_CONSTANT(MSAA_4X);
	BIND_ENUM_CONSTANT(MSAA_8X);
	BIND_ENUM_CONSTANT(MSAA_MAX);
	BIND_ENUM_CONSTANT(SCREEN_SPACE_AA_DISABLED);
	BIND_ENUM_CONSTANT(SCREEN_SPACE_AA_FXAA);
	BIND_ENUM_CONSTANT(SCREEN_SPACE_AA_MAX);
	BIND_ENUM_CONSTANT(RENDER_INFO_OBJECTS_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_PRIMITIVES_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_DRAW_CALLS_IN_FRAME);
	BIND_ENUM_CONSTANT(RENDER_INFO_MAX);
	BIND_ENUM_CONSTANT(RENDER_INFO_TYPE_VISIBLE);
	BIND_ENUM_CONSTANT(RENDER_INFO_TYPE_SHADOW);
	BIND_ENUM_CONSTANT(RENDER_INFO_TYPE_MAX);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_DISABLED);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_UNSHADED);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_LIGHTING);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_OVERDRAW);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_WIREFRAME);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_NORMAL_BUFFER);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_VOXEL_GI_ALBEDO);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_VOXEL_GI_LIGHTING);
	BIND_ENUM_CONSTANT(DEBUG_DRAW_VOXEL_GI_EMISSION);