### 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
if (ResourceLoader::get_resource_type(global_class_path) == "GDScript") {
						Error err = OK;
						res = GDScriptCache::get_full_script(global_class_path, err);
						if (err != OK) {
							_set_error("Can't load global class " + String(identifier), p_expression);
							r_error = ERR_COMPILATION_FAILED;
							return GDScriptCodeGenerator::Address();
						}
					} else {
						res = ResourceLoader::load(global_class_path);
						if (res.is_null()) {
							_set_error("Can't load global class " + String(identifier) + ", cyclic reference?", p_expression);
							r_error = ERR_COMPILATION_FAILED;
							return GDScriptCodeGenerator::Address();
						}
					}
				}
				return codegen.add_constant(res);
			}
#ifdef TOOLS_ENABLED
			if (GDScriptLanguage::get_singleton()->get_named_globals_map().has(identifier)) {
				GDScriptCodeGenerator::Address global = codegen.add_temporary(); 
				gen->write_store_named_global(global, identifier);
				return global;
			}
#endif
			
			_set_error("Identifier not found: " + String(identifier), p_expression);
			r_error = ERR_COMPILATION_FAILED;
			return GDScriptCodeGenerator::Address();