### 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
PREC_NONE,
		PREC_ASSIGNMENT,
		PREC_CAST,
		PREC_TERNARY,
		PREC_LOGIC_OR,
		PREC_LOGIC_AND,
		PREC_LOGIC_NOT,
		PREC_CONTENT_TEST,
		PREC_COMPARISON,
		PREC_BIT_OR,
		PREC_BIT_XOR,
		PREC_BIT_AND,
		PREC_BIT_SHIFT,
		PREC_ADDITION_SUBTRACTION,
		PREC_FACTOR,
		PREC_SIGN,
		PREC_BIT_NOT,
		PREC_POWER,
		PREC_TYPE_TEST,
		PREC_AWAIT,
		PREC_CALL,