Why do you have "Trigger once" in these events?
In my twisted mind, I tried to prevent the condition from firing every tick with "trigger once" and save some CPU power this way.
you need to add them into a container ... each pair will be logically linked together
Yeah, wow - it works that way! I couldn't imagine how a container object would figure out the neighboring object is his container partner without an ID. But it seems to be the time of creation in the editor that links them together. Many thanks for the help and this hint.