### 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 (!p_for_lambda && (is_implicit_initializer || is_implicit_ready)) {
		
		for (int i = 0; i < p_class->members.size(); i++) {
			if (p_class->members[i].type != GDScriptParser::ClassNode::Member::VARIABLE) {
				continue;
			}
			const GDScriptParser::VariableNode *field = p_class->members[i].variable;
			if (field->is_static) {
				continue;
			}
			if (field->onready != is_implicit_ready) {
				
				continue;
			}
			if (field->initializer) {
				
				codegen.generator->write_newline(field->initializer->start_line);
				GDScriptCodeGenerator::Address src_address = _parse_expression(codegen, r_error, field->initializer, false, true);
				if (r_error) {
					memdelete(codegen.generator);
					return nullptr;
				}
				GDScriptDataType field_type = _gdtype_from_datatype(field->get_datatype(), codegen.script);
				GDScriptCodeGenerator::Address dst_address(GDScriptCodeGenerator::Address::MEMBER, codegen.script->member_indices[field->identifier->name].index, field_type);
				if (field->use_conversion_assign) {
					codegen.generator->write_assign_with_conversion(dst_address, src_address);
				} else {
					codegen.generator->write_assign(dst_address, src_address);
				}
				if (src_address.mode == GDScriptCodeGenerator::Address::TEMPORARY) {