It seems that when player flies on elytra movement checks is disabled. And this says that server authoritative player movement with corrections is'nt complete.
Console Command Origin still is Actor that has position on 0, 0, 0
For example Block Command Origin has "pos" on block position where command was executed. This works as expected.
It seems that when player flies on elytra movement checks is disabled. And this says that server authoritative player movement with corrections is'nt complete.