Point-in-time recovery (PITR) by its very nature means that you will lose transactions. That is the idea! You want to restore the database at some point in time before all transactions.
Your standby databases will need to be restored to the same point as the primary database. You may find it easiest to use RMAN to clone the database, just like you did when you set up the standby database. Instructions are in the RMAN documentation.
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