X-ray source eFEDS J091646.9+015531. Top: HSC grz-color image of the central 2.5 × 2.5 arcmin region with X-ray contours overlaid. Bottom: MCMF richness vs. redshift plot, one of three cases of a photo-z mismatch with positional matches from the ACT-DR5 cluster catalog. MCMF finds two counterparts that are highlighted with vertical lines. The richer system at z = 1.17 is consistent with the ACT cluster. The different sensitivity to redshift for X-rays suggests that the low redshift is the better counterpart to the eFEDS source. Colors indicate different MCMF runs: HSC S19A (black), HSC S20A (blue), LS grz (red), and LS grzw1 (green) bands.