Why Zerodha don't let me cancel my F&O AMO order between 9-9:15 AM

From my understanding, F&O orders are not sent to exchange during pre-market. So why it won’t let me cancel them?

You can cancel FO AMO orders till 9.10 AM, Between 9.10 to 9.15 you cannot cancel AMO orders as we will pre-validate the FO orders ( Margin checks) so that at 9.15 orders will be placed on the exchange instantly at 9.15.

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