Is this yet another permutation?
Manual Check for Updates caused a visible download and installation of KB4457128 (and the routine stuff)
Requested Restart - after Restart, version is correct, KB4457128 has installed
once correctly and is shown in
Update History
and CP > Installed updates.
BUT KB4456655 also installed today (silently, apparently), but is
ONLY shown in CP > Installed updates
not in Update History
Now, to me, it APPEARS that KB4456655 installed first (before KB4457128) but cannot be sure.
If so, that would support the notion that KB4456655 is a prerequisite for KB4457128
In other words, my test PC did what it was meant to do but doesn't show all updates in all places.
As ever....my brain hurts!