### 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
}
	GDScriptCodeGenerator *gen = codegen.generator;
	switch (p_expression->type) {
		case GDScriptParser::Node::IDENTIFIER: {
			
			const GDScriptParser::IdentifierNode *in = static_cast<const GDScriptParser::IdentifierNode *>(p_expression);
			StringName identifier = in->name;
			
			if (codegen.parameters.has(identifier)) {
				return codegen.parameters[identifier];
			}
			
			if (!p_initializer && codegen.locals.has(identifier)) {
				return codegen.locals[identifier];
			}
			
			if (_is_class_member_property(codegen, identifier)) {
				
				GDScriptCodeGenerator::Address temp = codegen.add_temporary(_gdtype_from_datatype(p_expression->get_datatype(), codegen.script));
				gen->write_get_member(temp, identifier);
				return temp;
			}
			
			if (!codegen.function_node || !codegen.function_node->is_static) {
				
				if (codegen.script->member_indices.has(identifier)) {
					if (codegen.script->member_indices[identifier].getter != StringName() && codegen.script->member_indices[identifier].getter != codegen.function_name) {
						
						GDScriptCodeGenerator::Address temp = codegen.add_temporary(codegen.script->member_indices[identifier].data_type);
						Vector<GDScriptCodeGenerator::Address> args;