UE-67979
they changed the base replication with a Fortnite merge in 4.20
that being said, what was being sent didn’t change, it was always a primitive component they just made it able to not send a base at all if it was null
and bBaseRelativePosition is supposed to be dynamically set, its not a constant, it depends on if the movement base is mobile or not if it is static then it is false. It looks like the add static mesh component node isn’t referencing its parent correctly as ‘static’ vs ‘mobile’ has no affect on ‘bBaseRelativePosition’
If anyone is familiar enough with engine source to commit a fix please contact me.
Thanks