### 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 (is_member) {
					target = member; 
				} else {
					target = _parse_expression(codegen, r_error, assignment->assignee);
					if (r_error) {
						return GDScriptCodeGenerator::Address();
					}
				}
				GDScriptCodeGenerator::Address assigned_value = _parse_expression(codegen, r_error, assignment->assigned_value);
				if (r_error) {
					return GDScriptCodeGenerator::Address();
				}
				GDScriptCodeGenerator::Address to_assign;
				bool has_operation = assignment->operation != GDScriptParser::AssignmentNode::OP_NONE;
				if (has_operation) {
					
					GDScriptCodeGenerator::Address op_result = codegen.add_temporary(_gdtype_from_datatype(assignment->get_datatype(), codegen.script));
					GDScriptCodeGenerator::Address og_value = _parse_expression(codegen, r_error, assignment->assignee);
					gen->write_binary_operator(op_result, assignment->variant_op, og_value, assigned_value);
					to_assign = op_result;
					if (og_value.mode == GDScriptCodeGenerator::Address::TEMPORARY) {
						gen->pop_temporary();
					}
				} else {
					to_assign = assigned_value;
				}
				if (has_setter && !is_in_setter) {
					
					Vector<GDScriptCodeGenerator::Address> args;
					args.push_back(to_assign);