### Godot version

4.0.2.stable.mono

### System information

Windows 10 - 4.0.2.stable.mono - Any Renderer

### Issue description

In a script with an `@export` variable (with a non-default value), Godot will replace the first variable in the category with the same name. For example, if you're exporting a variable called "Vector", and the value is set to a non-default value, the first variable in the category called "Vector" will also be changed to the same value.

### Steps to reproduce

Attach said script to a node:
```
extends Node

@export var Vector: Vector2
@export_category("Vector")
@export var Var2: float = 1

func _process(delta):
	print(Var2)
```
When changing the value of the `Vector` export variable, the variable Var2 will contain the same value. This does not happen when the `@export_category` has a different name.

### Minimal reproduction project

N/A
type = FOR_VARIABLE;
				bind = p_identifier;
				name = p_identifier->name;
				source_function = p_source_function;
				start_line = p_identifier->start_line;
				end_line = p_identifier->end_line;
				start_column = p_identifier->start_column;
				end_column = p_identifier->end_column;
				leftmost_column = p_identifier->leftmost_column;
				rightmost_column = p_identifier->rightmost_column;
			}
		};
		Local empty;
		Vector<Local> locals;
		HashMap<StringName, int> locals_indices;
		FunctionNode *parent_function = nullptr;
		IfNode *parent_if = nullptr;
		bool has_return = false;
		bool has_continue = false;
		bool has_unreachable_code = false; 
		bool is_in_loop = false; 
		bool has_local(const StringName &p_name) const;
		const Local &get_local(const StringName &p_name) const;
		template <class T>
		void add_local(T *p_local, FunctionNode *p_source_function) {