Hey @Zim_TechArt thanks for taking care! I got the tipp that the way it works has changed and you have to click multiple times to select the children.
1 Click = select the parent actor/BP.
2 Clicks = select the HISM.
3 Clicks = select the instance.
This is actually a very cool and smart way IMO. The issue is just: Where to get that information from? xD