If you didn't provide bank information in the Easy Extension program, TurboTax wouldn't have any way to send a payment with your extension for you.
It may be some sort of marker that the IRS uses (though I don't see any such thing in my own account, and I have also filed an extension.)
Unfortunately, we don't have any way to know and I can't think of any reason.
I'd give it some time perhaps to settle out, and then reach out to the IRS if you are still concerned.
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