Total (contours) and polarized intensity (color map, in mJy beam⁻¹) on May 18, 2018. The base contour levels are 0.005 for 23 and 43 GHz (top and middle panels), and 0.02 for 86 GHz (bottom panel). The polarized maximum is consistently displaced from the total intensity maximum and instead coincides with the positions of the stationary features. In the lower two frequencies, the left and middle of the moving shocks around 1 to 1.5 mas from the core are weakly polarized.