The incident took place in the 19th over of Kings XI Punjab's run-chase when Mayank Agarwal played a shot and took two runs. However, the on-field umpire Nitin Menon deemed it as a single, declaring that Chris Jordan did not tap his bat past the crease.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/ipl/top-stories/ipl-2020-umpire-should-be-man-of-the-match-virender-sehwag-reacts-to-short-run-decision-in-dc-vs-kxip-game/articleshow/78227241.cms