There was an oversight in the notes a year or so ago when the change was made. To be clear older versions like 1.30 supported 256 MB maps, it is not a new change with 1.31.
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i have checked all of the patch notes since version 1.24 and i found nothing.
Does it matter? You can try hosting such a large map yourself and see that it works.
creating a map that large is difficult.