Seems plausible: the wavelength is in a good size range for such an effect to be noticeable.

I found that in a typical microwave oven, the frequency is about 2450 MHz. Using the formula, velocity = frequency × wavelength and knowing that the velocity of an electromagnetic wave is about 3.0 × 108 m/s, gives a wavelength of about 12 cm.

Same thing happens in chemical mixing in a vat. You want it off center. I might have a diagram in one of my old textbooks if you want.