Did you not see the women hammer throwers?
The rule require a jump-off. One additional attempt at the final height. If still tied then height changed by the current incremental change (5cm in this case) - both fail, then lower by 5cm, both succeed increase by 5cm until tie is resolved. That could take a while, especially in PV.
If both agree not to jump off then it is a tie.
The jump-off rule only applies in HJ and PV and only to first place. A tie for third would always give 2 bronzes.