Custom navigation direction doesn't work on UE 5.5

Hello!

I am using Navigation directions to navigate through my menus. I use Explicit directions as much as possible but for certain buttons, I have to use Custom or Custom Boundary and set the focused widget myself.

It works fine in Editor, but as soon as I play a packaged build, it doesn’t work. The Custom functions are not called at all (tried with a print) and instead do as they will (if a button is in this direction, it will get focused otherwise nothing will happen, in any case that is not the wanted behavior).

Things I did:

  • Checked an older version of my project that was on UE 5.4 and it works fine.
  • Compared my functions, controllers, focus sets etc. and both game versions are the same.
  • Compared all .ini to see something weird, found nothing.
  • Compared both logs from a debuggame build, found nothing.
  • Compared all source files containing EUINavigationRule::Custom, in both 5.4 and 5.5, found nothing.

I don’t know what I can try more, if anyone has a clue!

Thanks a lot