### 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
type = VARIABLE;
				variable = p_variable;
				name = p_variable->identifier->name;
				source_function = p_source_function;
				start_line = p_variable->start_line;
				end_line = p_variable->end_line;
				start_column = p_variable->start_column;
				end_column = p_variable->end_column;
				leftmost_column = p_variable->leftmost_column;
				rightmost_column = p_variable->rightmost_column;
			}
			Local(ParameterNode *p_parameter, FunctionNode *p_source_function) {
				type = PARAMETER;
				parameter = p_parameter;
				name = p_parameter->identifier->name;
				source_function = p_source_function;
				start_line = p_parameter->start_line;
				end_line = p_parameter->end_line;
				start_column = p_parameter->start_column;
				end_column = p_parameter->end_column;
				leftmost_column = p_parameter->leftmost_column;
				rightmost_column = p_parameter->rightmost_column;
			}
			Local(IdentifierNode *p_identifier, FunctionNode *p_source_function) {