Hi there,
I can confirm that I can reproduce the behaviour you are seeing.
This is inconsistent with how Actors currently function, and is also a regression from 5.4. I believe it was introduced in this commit. It seems as though child widgets that have parents with Enhanced Input bindings do not currently get bAutomaticallyRegisterInputOnConstruction set correctly (at least, with an empty event graph).
I will go ahead and submit a bug report for this issue and circle back here to provide an issue tracker link when one is available.
In the meantime it is possible to workaround this issue. If you create a dummy Input Action and bind this in your child widget, as long as that dummy binding is plugged into some other node then the child widget will be compiled with bAutomaticallyRegisterInputOnConstruction set to true and all parent bindings will function correctly. An example event graph for the child might look like the following:
[Image Removed]
Thanks.