### 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
prop_info.hint_string = export_info.hint_string;
					prop_info.usage = export_info.usage | PROPERTY_USAGE_SCRIPT_VARIABLE;
				} else {
					prop_info.usage = PROPERTY_USAGE_SCRIPT_VARIABLE;
				}
				if (variable->is_static) {
					minfo.index = p_script->static_variables_indices.size();
					p_script->static_variables_indices[name] = minfo;
				} else {
					p_script->member_info[name] = prop_info;
					p_script->member_indices[name] = minfo;
					p_script->members.insert(name);
				}
#ifdef TOOLS_ENABLED
				if (variable->initializer != nullptr && variable->initializer->is_constant) {
					p_script->member_default_values[name] = variable->initializer->reduced_value;
					GDScriptCompiler::convert_to_initializer_type(p_script->member_default_values[name], variable);
				} else {
					p_script->member_default_values.erase(name);
				}
#endif
			} break;
			case GDScriptParser::ClassNode::Member::CONSTANT: {
				const GDScriptParser::ConstantNode *constant = member.constant;
				StringName name = constant->identifier->name;
				p_script->constants.insert(name, constant->initializer->reduced_value);
			} break;
			case GDScriptParser::ClassNode::Member::ENUM_VALUE: {
				const GDScriptParser::EnumNode::Value &enum_value = member.enum_value;
				StringName name = enum_value.identifier->name;