### 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
PROP_NONE,
			PROP_INLINE,
			PROP_SETGET,
		};
		PropertyStyle property = PROP_NONE;
		union {
			FunctionNode *setter = nullptr;
			IdentifierNode *setter_pointer;
		};
		IdentifierNode *setter_parameter = nullptr;
		union {
			FunctionNode *getter = nullptr;
			IdentifierNode *getter_pointer;
		};
		bool exported = false;
		bool onready = false;
		PropertyInfo export_info;
		int assignments = 0;
		bool is_static = false;
#ifdef TOOLS_ENABLED
		String doc_description;
#endif 
		VariableNode() {