I also get the same. I am using V16.6 with S016 hotfix. Just to try something different I also moved a component placement outline and selected snap to shape centre. It snapped to the component origin :).
Jim O'MahonyStudiel Toulouse
I am running 16.6 -S016. Symbols Center works for me on everything except linear dimensioning. Datum dimensioning works, just not linear. Looks like it might be broken.