### 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
switch (type) {
					case CLASS:
						return m_class;
					case CONSTANT:
						return constant;
					case FUNCTION:
						return function;
					case VARIABLE:
						return variable;
					case ENUM:
						return m_enum;
					case ENUM_VALUE:
						return enum_value.identifier;
					case SIGNAL:
						return signal;
					case GROUP:
						return annotation;
					case UNDEFINED:
						return nullptr;
				}
				ERR_FAIL_V_MSG(nullptr, "Reaching unhandled type.");
			}
			Member() {}