### Godot version

4.0.2.stable

### System information

Ubuntu 22.10

### Issue description

This happens when converting a godot3 project to a godot4 project.
Godot3 source
```gdscript
extends Node2D

export(int) var integer := 2
export(Resource) var resource: Resource = null
```

Result
```gdscript
extends Node2D

@export var integer: int := 2
@export var resource: Resource: Resource = null
```

Expected result
```gdscript
extends Node2D

@export var integer := 2
@export var resource: Resource = null
```

If someone can point to where in the code this might be fixed maybe I can fix it myself, sounds like a good first issue.


### Steps to reproduce

Open the given project (or any project really) and convert it to a godot 4 project

### Minimal reproduction project

[Conversion Tool Typing Problem.zip](https://github.com/godotengine/godot/files/11185334/Conversion.Tool.Typing.Problem.zip)

valid = valid && test_conversion_with_regex("[Sync]", "[RPC(MultiplayerAPI.RPCMode.AnyPeer, CallLocal = true)]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_with_regex("[Slave]", "[RPC]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_with_regex("[Puppet]", "[RPC]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_with_regex("[PuppetSync]", "[RPC(CallLocal = true)]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_with_regex("[Master]", "The master and mastersync rpc behavior is not officially supported anymore. Try using another keyword or making custom logic using Multiplayer.GetRemoteSenderId()\n[RPC]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_with_regex("[MasterSync]", "The master and mastersync rpc behavior is not officially supported anymore. Try using another keyword or making custom logic using Multiplayer.GetRemoteSenderId()\n[RPC(CallLocal = true)]", &ProjectConverter3To4::rename_csharp_attributes, "custom rename csharp", reg_container);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.window_resizable: pass", "\tif (not get_window().unresizable): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.is_window_resizable(): pass", "\tif (not get_window().unresizable): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_window_resizable(Settings.resizable)", "\tget_window().unresizable = not (Settings.resizable)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.window_resizable = Settings.resizable", "\tget_window().unresizable = not (Settings.resizable)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.window_fullscreen: pass", "\tif ((get_window().mode == Window.MODE_EXCLUSIVE_FULLSCREEN) or (get_window().mode == Window.MODE_FULLSCREEN)): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.is_window_fullscreen(): pass", "\tif ((get_window().mode == Window.MODE_EXCLUSIVE_FULLSCREEN) or (get_window().mode == Window.MODE_FULLSCREEN)): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_window_fullscreen(Settings.fullscreen)", "\tget_window().mode = Window.MODE_EXCLUSIVE_FULLSCREEN if (Settings.fullscreen) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.window_fullscreen = Settings.fullscreen", "\tget_window().mode = Window.MODE_EXCLUSIVE_FULLSCREEN if (Settings.fullscreen) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.window_maximized: pass", "\tif (get_window().mode == Window.MODE_MAXIMIZED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.is_window_maximized(): pass", "\tif (get_window().mode == Window.MODE_MAXIMIZED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_window_maximized(Settings.maximized)", "\tget_window().mode = Window.MODE_MAXIMIZED if (Settings.maximized) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.window_maximized = Settings.maximized", "\tget_window().mode = Window.MODE_MAXIMIZED if (Settings.maximized) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.window_minimized: pass", "\tif (get_window().mode == Window.MODE_MINIMIZED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.is_window_minimized(): pass", "\tif (get_window().mode == Window.MODE_MINIMIZED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_window_minimized(Settings.minimized)", "\tget_window().mode = Window.MODE_MINIMIZED if (Settings.minimized) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.window_minimized = Settings.minimized", "\tget_window().mode = Window.MODE_MINIMIZED if (Settings.minimized) else Window.MODE_WINDOWED", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.vsync_enabled: pass", "\tif (DisplayServer.window_get_vsync_mode() != DisplayServer.VSYNC_DISABLED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.is_vsync_enabled(): pass", "\tif (DisplayServer.window_get_vsync_mode() != DisplayServer.VSYNC_DISABLED): pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_use_vsync(Settings.vsync)", "\tDisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED if (Settings.vsync) else DisplayServer.VSYNC_DISABLED)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.vsync_enabled = Settings.vsync", "\tDisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED if (Settings.vsync) else DisplayServer.VSYNC_DISABLED)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.screen_orientation = OS.SCREEN_ORIENTATION_VERTICAL: pass", "\tif DisplayServer.screen_get_orientation() = DisplayServer.SCREEN_VERTICAL: pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tif OS.get_screen_orientation() = OS.SCREEN_ORIENTATION_LANDSCAPE: pass", "\tif DisplayServer.screen_get_orientation() = DisplayServer.SCREEN_LANDSCAPE: pass", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.set_screen_orientation(Settings.orient)", "\tDisplayServer.screen_set_orientation(Settings.orient)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);
	valid = valid && test_conversion_gdscript_builtin("\tOS.screen_orientation = Settings.orient", "\tDisplayServer.screen_set_orientation(Settings.orient)", &ProjectConverter3To4::rename_gdscript_functions, "custom rename", reg_container, false);