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I think there was one prelim in April 2022 as well; but yes, since AIBE is not needed it doesn't matter
I meant prior to 2023, obviously. See point 2 again.

2023, December. 2021, April. So not in December every year. Therefore the concern expressed in the OP will not arise.
Last pre was not in 2021 though; and there was a pre in 2023 itself