I got a groovy 1x2 jumper plate with my 9495 Gold Leader's Y-Wing. Literally. Of the two red jumper plates in the set one is "normal" and the other has a groove just like tiles have had for the last 30 years.
Much of my late 1970s childhood LEGO had 1x2 and 2x2 tiles without groove and I have often wondered why LEGO then added the groove to regular tiles but not to the jumper plate. It seems they have "fixed" that now.
According to BrickLink part 3794b
has been around since 2009 as an alternate, but this is the first one I've ever come across.