### 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
NONE = 0,
			SCRIPT = 1 << 0,
			CLASS = 1 << 1,
			VARIABLE = 1 << 2,
			CONSTANT = 1 << 3,
			SIGNAL = 1 << 4,
			FUNCTION = 1 << 5,
			STATEMENT = 1 << 6,
			STANDALONE = 1 << 7,
			CLASS_LEVEL = CLASS | VARIABLE | FUNCTION,
		};
		uint32_t target_kind = 0; 
		AnnotationAction apply = nullptr;
		MethodInfo info;
	};
	HashMap<StringName, AnnotationInfo> valid_annotations;
	List<AnnotationNode *> annotation_stack;
	typedef ExpressionNode *(GDScriptParser::*ParseFunction)(ExpressionNode *p_previous_operand, bool p_can_assign);
	
	enum Precedence {