I found another bug with the standard health manager behaviour (that also happens when I create a behaviour myself, see attached file)...
Every second spawned actor is being spawned with "Max Health"-1
This is also not fixed when I set Current Health to Max Health on spawn.
(In my example please understand that the first shown actor (the gem) is pre-set and does not count into the every second spawned actor problem. The problem starts thus with the "third" actor which is the second one that is being spawned.