Turnovers often lead to lost games. The play in any football game that has the greatest chance of leading to a turnover is a punt return. There were 842 turnovers in the regular season last year on 33965 plays from scrimmage (2.47% of all plays resulted in a turnover). There were 2429 punts last season, 1138 of which were fielded by the returner. On those 1138 fielded punts, 87 fumbles occurred (7.64%). So fumbles on fielded punts happened more than three times as often as fumbles on all other plays.
I’m not sure why fumbles were up and long punt returns down last season.