I am looking at the same code and running into the same error. To me it looks like the code that was calling the ctor in Javascript got moved to // move to javascriptgeneratedclass_* according to some commented out code sitting in JacvascriptContext_private.cpp around line 761. From what I can tell prector() is being called when the ObjectInitializer is valid, and the ctor() function is being called after the object has already initialized. So unless that is a bug try creating your component in prector() instead.

If I restore the code in JavascriptContext_private.cpp and comment out the call of the ctor() in JavascriptGeneratedClass.cpp all of my code that was working in 4.21 is now working in 4.23.

If I move all my CreateDefaultSubobject calls to prector() I get all kinds of fun invalid memory access crashes.

I think we have a bug on our hands, or a new pattern for calling CreateDefaultSubobject, that I do not see documented anywhere.

Looks like this code was changed 6 months ago in a big merge from commit 44dfabd

There are no examples in the repository that actually use CreateDefaultSubobject although the following wiki entries will all fail unless resolved:

https://github.com/ncsoft/Unreal.js/wiki/Creating-a-component
https://github.com/ncsoft/Unreal.js/wiki/Android
https://github.com/ncsoft/Unreal.js/wiki/Creating-a-custom-component
https://github.com/ncsoft/Unreal.js/wiki/First-Person-Template-in-Unreal.js
https://github.com/ncsoft/Unreal.js/wiki/Third-Person-Template-in-Unreal.js

I tried prector () and it crashed.

I can submit a PR but without any kind of tests I am not sure if it was intended to break this functionality in an attempt to enable something else.