### Godot version

4.0.2

### System information

Ubuntu 22.04.1 LTS

### Issue description

So far I've found these ones:

![Screenshot from 2023-05-10 17-56-42](https://github.com/godotengine/godot/assets/85438892/b161b14a-cb7d-46fe-8398-816bf354a929)
![Screenshot from 2023-05-10 18-01-02](https://github.com/godotengine/godot/assets/85438892/b0fefcfb-4246-4ebb-ae7b-dd798d7a1d63)

But there are likely more like them. They are invalid, at least in the context I encountered them here (at the beginning of a regular line of script)

### Steps to reproduce

Type `Anchor` in the code editor.

### Minimal reproduction project

N/A
case GDScriptParser::COMPLETION_SUBSCRIPT: {
			const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(completion_context.node);
			GDScriptCompletionIdentifier base;
			if (!_guess_expression_type(completion_context, subscript->base, base)) {
				break;
			}
			_find_identifiers_in_base(base, false, options, 0);
		} break;
		case GDScriptParser::COMPLETION_TYPE_ATTRIBUTE: {
			if (!completion_context.current_class) {
				break;
			}
			const GDScriptParser::TypeNode *type = static_cast<const GDScriptParser::TypeNode *>(completion_context.node);
			bool found = true;
			GDScriptCompletionIdentifier base;
			base.type.kind = GDScriptParser::DataType::CLASS;
			base.type.type_source = GDScriptParser::DataType::INFERRED;
			base.type.is_constant = true;
			base.type.class_type = completion_context.current_class;
			base.value = completion_context.base;
			for (int i = 0; i < completion_context.current_argument; i++) {
				GDScriptCompletionIdentifier ci;
				if (!_guess_identifier_type_from_base(completion_context, base, type->type_chain[i]->name, ci)) {
					found = false;
					break;
				}
				base = ci;
			}
			
			if (found) {