I’m doing it from the blueprint. It seems that calling virtual functions from the constructor is problematic.
In any case, the replication works perfectly… Only there is something that suddenly breaks everything… without that something everything works fine.
I will fight!! 
If I lose the battle I’ll do a downgrade… I don’t rule out the possibility that it’s a bug in the engine… maybe in the previous version there isn’t this problem.
Thanks 3dRaven!!