### 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
LITERAL,
			MATCH,
			MATCH_BRANCH,
			PARAMETER,
			PASS,
			PATTERN,
			PRELOAD,
			RETURN,
			SELF,
			SIGNAL,
			SUBSCRIPT,
			SUITE,
			TERNARY_OPERATOR,
			TYPE,
			TYPE_TEST,
			UNARY_OPERATOR,
			VARIABLE,
			WHILE,
		};
		Type type = NONE;
		int start_line = 0, end_line = 0;
		int start_column = 0, end_column = 0;
		int leftmost_column = 0, rightmost_column = 0;
		Node *next = nullptr;
		List<AnnotationNode *> annotations;
#ifdef DEBUG_ENABLED
		Vector<GDScriptWarning::Code> ignored_warnings;
#endif
		DataType datatype;
		virtual DataType get_datatype() const { return datatype; }