Don't confuse the NFL with the NF. I believe that the NFL rule addresses defensive penalties only. Under NF rules, 3-3-3a specifically, a period must be extended by an untimed down if during the last timed down, there was a foul, other than unsportsmanlike or non-player, by either team and the penalty is accepted.
In the play you described, Team A would have one untimed down, unless the OPI occurred on 4th down. If it was 4th down, then Team B would get the ball for one untimed down.
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