Extending from an abstract class bloats the `tscn` file with properties with default values

### Tested versions

Godot Engine v4.2.1

### System information

Godot v4.2.1.stable (b09f793f5) - Freedesktop SDK 23.08 (Flatpak runtime) - X11 - GLES3 (Compatibility) - AMD Radeon Vega 8 Graphics (radeonsi, raven, LLVM 17.0.6, DRM 3.42, 5.15.0-91-generic) () - AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx (8 Threads)

### Issue description

As the title suggests.

The following is the (partial) content of the `tscn` file that I got when I did the `steps to reproduce` below:
```
[gd_scene load_steps=2 format=3 uid="uid://c0rcsci2apet4"]

[ext_resource type="Script" path="res://test1.gd" id="1_iw8vt"]

[node name="Test" type="Control"]
layout_mode = 3
anchors_preset = 0

[node name="TestClass" type="BaseButton" parent="."]
_import_path = NodePath("")
unique_name_in_owner = false
process_mode = 0
process_priority = 0
process_physics_priority = 0
process_thread_group = 0
editor_description = ""
visible = true
modulate = Color(1, 1, 1, 1)
self_modulate = Color(1, 1, 1, 1)
show_behind_parent = false
top_level = false
clip_children = 0
light_mask = 1
visibility_layer = 1
z_index = 0
z_as_relative = true
y_sort_enabled = false
texture_filter = 0
texture_repeat = 0
material = null
use_parent_material = false
clip_contents = false
custom_minimum_size = Vector2(0, 0)
layout_direction = 0
layout_mode = 0
anchors_preset = 0
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
offset_left = 0.0
offset_top = 0.0
offset_right = 40.0
offset_bottom = 40.0
(and so on)
```

### Steps to reproduce

- Create a new script with the following code:
```
class_name TestClass
extends BaseButton # I only tested BaseButton & Range
```
- Create a new scene, then add the `TestClass` as a child node.

### Minimal reproduction project (MRP)

n/a

Start by reproducing the issue with Godot v4.2.1 using the TestClass script extending BaseButton and inspect the resulting .tscn file. No source file, test, or entry point is named; trace the scene-saving path and verify that adding the abstract-derived node no longer writes unnecessary default-valued properties.

Written by the indexing model from the issue text.