If you consider the device for a moment, you will note it is based on
a technology called CMOS where "C" stands in full for "complementary
symmetry".  This means that every part of the circuit has symmetrical
connections to both Vcc and Gnd.  Except for inputs with deliberate
asymmetry to make them compatible to TTL (which is indeed ground-
referenced) outputs, Vcc and Gnd are indistinguishable in the circuit;
their functions can be exchanged using a negative supply and suitable
alteration in logic notation!

  In other words, it doesn't have a ground reference, the threshold is
halfway between Gnd and Vcc for the function in question, so it makes
not a whit of difference to which rail you fit the load capacitors.
Lack of bypassing would be expected to cause as much mayhem with the
load caps on Gnd as on Vcc.

  Anyone fault this analysis?
        Paul B.