ICC's new rule for T20Is: Under the new ICC rule, if the fielding team is not in a position to bowl the first ball of the final over by the scheduled time then one fewer fielder will be permitted outside of the 30-yard circle for the remaining overs of the innings.
source https://www.jagranjosh.com/current-affairs/icc-new-playing-conditions-for-t20is-1641551304-1