### 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
p_script->constants.insert(name, enum_value.value);
			} break;
			case GDScriptParser::ClassNode::Member::SIGNAL: {
				const GDScriptParser::SignalNode *signal = member.signal;
				StringName name = signal->identifier->name;
				Vector<StringName> parameters_names;
				parameters_names.resize(signal->parameters.size());
				for (int j = 0; j < signal->parameters.size(); j++) {
					parameters_names.write[j] = signal->parameters[j]->identifier->name;
				}
				p_script->_signals[name] = parameters_names;
			} break;
			case GDScriptParser::ClassNode::Member::ENUM: {
				const GDScriptParser::EnumNode *enum_n = member.m_enum;
				StringName name = enum_n->identifier->name;
				p_script->constants.insert(name, enum_n->dictionary);
			} break;
			case GDScriptParser::ClassNode::Member::GROUP: {
				const GDScriptParser::AnnotationNode *annotation = member.annotation;
				StringName name = annotation->export_info.name;
				
				GDScript::MemberInfo minfo;
				minfo.index = p_script->member_indices.size();
				PropertyInfo prop_info;
				prop_info.name = name;
				prop_info.usage = annotation->export_info.usage;
				prop_info.hint_string = annotation->export_info.hint_string;
				p_script->member_info[name] = prop_info;
				p_script->member_indices[name] = minfo;
				p_script->members.insert(name);