So this is my Blueprint. Sorry, I was wrong, I did implement it in ThirdPersonCharacter.
When I press play though, the OSC reeceiver device closes down without error and when I add a Print at the end of the bundle, it won’t print the position but the default “hello” string. When I use it without Bundle and without GetActorLocation but with randomFloat instead, it works fine. So my guess is either the Bundle part is wrong or the GetActorLocation,but maybe it’s the break Vector part?