### 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
ForNode *parse_for();
	IfNode *parse_if(const String &p_token = "if");
	MatchNode *parse_match();
	MatchBranchNode *parse_match_branch();
	PatternNode *parse_match_pattern(PatternNode *p_root_pattern = nullptr);
	WhileNode *parse_while();
	
	ExpressionNode *parse_expression(bool p_can_assign, bool p_stop_on_assign = false);
	ExpressionNode *parse_precedence(Precedence p_precedence, bool p_can_assign, bool p_stop_on_assign = false);
	ExpressionNode *parse_literal(ExpressionNode *p_previous_operand, bool p_can_assign);
	LiteralNode *parse_literal();
	ExpressionNode *parse_self(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_identifier(ExpressionNode *p_previous_operand, bool p_can_assign);
	IdentifierNode *parse_identifier();
	ExpressionNode *parse_builtin_constant(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_unary_operator(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_binary_operator(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_binary_not_in_operator(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_ternary_operator(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_assignment(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_array(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_dictionary(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_call(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_get_node(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_preload(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_grouping(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_cast(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_await(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_attribute(ExpressionNode *p_previous_operand, bool p_can_assign);
	ExpressionNode *parse_subscript(ExpressionNode *p_previous_operand, bool p_can_assign);