Entities duplicated after adding 2nd HA thru Companion App

Upgrading to HA on RPI5. Added automation to trigger notification to mobile. Could not add notification to this mobile because it was already linked to my other ‘old’ (RPI4) HA.
Solved by adding RPI5 HA as 2nd server through Companion App.

However, now all entities in my RPI5 HA have been duplicated. The only difference between each two I can see is that one has a normal (‘-’) status and the other ‘unmanageable’.

Futhermore I do not see the same in my old RPI4 HA. Entities there are not duplicated.

Is this normal behavior?

Good hour later all ‘unmangeable’ duplicates have automagically disappeared.

In good Dutch we would say ‘schiet mij maar lek’ to express surprise and unbelieve.

I have no clue whatsoever what happened. Happy it’s gone away, unhappy not knowing what caused it.