### 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
codegen.generator->pop_temporary();
				}
			}
		}
	}
	
	if (p_func) {
		if (optional_parameters > 0) {
			codegen.generator->start_parameters();
			for (int i = p_func->parameters.size() - optional_parameters; i < p_func->parameters.size(); i++) {
				const GDScriptParser::ParameterNode *parameter = p_func->parameters[i];
				GDScriptCodeGenerator::Address src_addr = _parse_expression(codegen, r_error, parameter->initializer);
				if (r_error) {
					memdelete(codegen.generator);
					return nullptr;
				}
				GDScriptCodeGenerator::Address dst_addr = codegen.parameters[parameter->identifier->name];
				codegen.generator->write_assign_default_parameter(dst_addr, src_addr, parameter->use_conversion_assign);
				if (src_addr.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
					codegen.generator->pop_temporary();
				}
			}
			codegen.generator->end_parameters();
		}
		
		r_error = _parse_block(codegen, p_func->body, true, false);
		if (r_error) {
			memdelete(codegen.generator);
			return nullptr;
		}