Simulation at the EBL Workshop in Cyprus, 2018

This is the ending -

Answers in the EBL notes

Law 62: D. Revoke on Trick Twelve
1. On the twelfth trick, a revoke, even if established, must be corrected if discovered before all four hands have been returned to the board.

When East corrects his revoke at trick 12 by playing his club, West cannot change his card (the H9). Therefore declarer wins trick 12!   Trick 13 is won by the defenders twice over.

Law 64 B. No Automatic Trick Adjustment
There is no automatic trick adjustment following an established revoke (but see Law 64C) if:
1. the offending side did not win either the revoke trick or any subsequent trick.
2. it is a subsequent revoke in the same suit by the same player, the first revoke having been established.
3. the revoke was made in failing to play a penalty card or any card belonging to dummy.
4. attention was first drawn to the revoke after a member of the non-offending side has made a call on the subsequent deal.
5. attention was first drawn to the revoke after the round has ended.
6. it is a revoke on the twelfth trick.

and Law 64C. Redress of Damage
1. When, after any established revoke, including those not subject to trick adjustment, the Director deems that the non-offending side is insufficiently compensated by this Law for the damage caused, he shall assign an adjusted score.

You need to work out what would have happened had there been no revoke. In that case, West would ruff trick 12 and East gets trick 13. So declarer gets no tricks.