Mahjong Yaku bug

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Date & Time: 07/27/2021 9:20PM JST (estimated)
Frequency: once
World name: Tonberry
Character name: Ashika Shika
Area and coordinates: Gold Saucer
Steps:
1. Mahjong game (Novice Quick Ranked Match)

Please see screenshot and red circle mark: https://imgur.com/a/sWCm5x9

Game did not register South tile as possible to call Ron and instead declared I was on furiten because of no yaku. I was not able to immediately take a screenshot.