### 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
UNDETECTED, 
			INFERRED, 
			ANNOTATED_EXPLICIT, 
			ANNOTATED_INFERRED, 
		};
		TypeSource type_source = UNDETECTED;
		bool is_constant = false;
		bool is_read_only = false;
		bool is_meta_type = false;
		bool is_pseudo_type = false; 
		bool is_coroutine = false; 
		Variant::Type builtin_type = Variant::NIL;
		StringName native_type;
		StringName enum_type; 
		Ref<Script> script_type;
		String script_path;
		ClassNode *class_type = nullptr;
		MethodInfo method_info; 
		HashMap<StringName, int64_t> enum_values; 
		_FORCE_INLINE_ bool is_set() const { return kind != RESOLVING && kind != UNRESOLVED; }