GDScript Compiler: Crash when using GDScript as type

[rune-scape]

Godot version

963ffd8

System information

Windows 10 x64

Issue description

i think #68374 revealed a regression, i was testing another issue, and the attached project crashes on startup:

================================================================
CrashHandlerException: Program crashed
Engine version: Godot Engine v4.0.beta.custom_build (963ffd8b944db768a9b7d09eeec025907f50843c)
Dumping the backtrace. Please include this when reporting the bug to the project developer.
[0] GDScriptDataType::operator PropertyInfo (C:\git\godot_bugfixes\modules\gdscript\gdscript_function.h:163)
[1] GDScriptCompiler::_populate_class_members (C:\git\godot_bugfixes\modules\gdscript\gdscript_compiler.cpp:2302)
[2] GDScriptCompiler::compile (C:\git\godot_bugfixes\modules\gdscript\gdscript_compiler.cpp:2640)
[3] GDScript::reload (C:\git\godot_bugfixes\modules\gdscript\gdscript.cpp:881)
[4] GDScript::_set (C:\git\godot_bugfixes\modules\gdscript\gdscript.cpp:982)
[5] GDScript::_setv (C:\git\godot_bugfixes\modules\gdscript\gdscript.h:61)
[6] Object::set (C:\git\godot_bugfixes\core\object\object.cpp:293)
[7] ResourceLoaderText::load (C:\git\godot_bugfixes\scene\resources\resource_format_text.cpp:638)
[8] ResourceFormatLoaderText::load (C:\git\godot_bugfixes\scene\resources\resource_format_text.cpp:1575)
[9] ResourceLoader::_load (C:\git\godot_bugfixes\core\io\resource_loader.cpp:206)
[10] ResourceLoader::_thread_load_function (C:\git\godot_bugfixes\core\io\resource_loader.cpp:233)
[11] ResourceLoader::load (C:\git\godot_bugfixes\core\io\resource_loader.cpp:563)
[12] EditorNode::load_scene (C:\git\godot_bugfixes\editor\editor_node.cpp:3843)
[13] EditorNode::_load_open_scenes_from_config (C:\git\godot_bugfixes\editor\editor_node.cpp:5113)
[14] EditorNode::_load_docks (C:\git\godot_bugfixes\editor\editor_node.cpp:4901)
[15] EditorNode::_sources_changed (C:\git\godot_bugfixes\editor\editor_node.cpp:1083)
[16] call_with_variant_args_helper<EditorNode,bool,0> (C:\git\godot_bugfixes\core\variant\binder_common.h:267)
[17] call_with_variant_args<EditorNode,bool> (C:\git\godot_bugfixes\core\variant\binder_common.h:377)
[18] CallableCustomMethodPointer<EditorNode,bool>::call (C:\git\godot_bugfixes\core\object\callable_method_pointer.h:105)
[19] Callable::callp (C:\git\godot_bugfixes\core\variant\callable.cpp:51)
[20] Object::emit_signalp (C:\git\godot_bugfixes\core\object\object.cpp:1047)
[21] Object::emit_signal<bool> (C:\git\godot_bugfixes\core\object\object.h:867)
[22] EditorFileSystem::_notification (C:\git\godot_bugfixes\editor\editor_file_system.cpp:1241)
[23] EditorFileSystem::_notificationv (C:\git\godot_bugfixes\editor\editor_file_system.h:143)
[24] Object::notification (C:\git\godot_bugfixes\core\object\object.cpp:792)
[25] SceneTree::_notify_group_pause (C:\git\godot_bugfixes\scene\main\scene_tree.cpp:870)
[26] SceneTree::process (C:\git\godot_bugfixes\scene\main\scene_tree.cpp:468)
[27] Main::iteration (C:\git\godot_bugfixes\main\main.cpp:3164)
[28] OS_Windows::run (C:\git\godot_bugfixes\platform\windows\os_windows.cpp:999)
[29] widechar_main (C:\git\godot_bugfixes\platform\windows\godot_windows.cpp:181)
[30] _main (C:\git\godot_bugfixes\platform\windows\godot_windows.cpp:203)
[31] main (C:\git\godot_bugfixes\platform\windows\godot_windows.cpp:217)
[32] WinMain (C:\git\godot_bugfixes\platform\windows\godot_windows.cpp:231)
[33] __scrt_common_main_seh (d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288)
[34] BaseThreadInitThunk
-- END OF BACKTRACE --
================================================================


### Steps to reproduce

just opening the project crashes

### Minimal reproduction project

[issue-67163.zip](https://github.com/godotengine/godot/files/10018031/issue-67163.zip)

[Chaosus]

Interesting that for me, the project you provided doesn't lead to a crash (at the 5993209 commit), maybe I was too hasty for merging it...

[rune-scape]

maybe i didnt list the right commit...
the fix should still be there, when i made the original pr, i didnt know there was code that assumed script_type would be valid, and it didnt seem like the current code ensured that

[rune-scape]

its a crash waiting to happen if nothing else

[rune-scape]

crashes on my machine at 5993209
the commit right before #68717 was merged