### 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
UNDEFINED,
				CONSTANT,
				VARIABLE,
				PARAMETER,
				FOR_VARIABLE,
				PATTERN_BIND,
			};
			Type type = UNDEFINED;
			union {
				ConstantNode *constant = nullptr;
				VariableNode *variable;
				ParameterNode *parameter;
				IdentifierNode *bind;
			};
			StringName name;
			FunctionNode *source_function = nullptr;
			int start_line = 0, end_line = 0;
			int start_column = 0, end_column = 0;
			int leftmost_column = 0, rightmost_column = 0;
			DataType get_datatype() const;
			String get_name() const;
			Local() {}