I also had problems with On Begin Actor Overlap in a packaged build and this was one of the top results after a search.
I managed to solve this and maybe someone else that finds this thread will think it’s useful so I’ll share it here.
Instead of binding my event to OnBeginActorOverlap I get a Primitive Component (to make the function as flexible as possible) and bind to OnBeginComponentOverlap on the component and then it worked fine. I guess the downside is if you have multiple collision components on your actor only the first one found will trigger the event, but in that case you could instead get all Primitive Components and bind to them with a for each loop.
