Export As does not respect Large Canvas scale (Illustrator 29.2.1)
If you are in a "large canvas" document, when using the "Export As" menu to export PNG(s), the resulting files are 1/10th the dimensions they should be. For example, if I have 100" x 100" artboards and export them at 72dpi, the resulting images should be 7200x7200 pixels, but they are only 720x720 (but still at 72dpi). This happens with "Use Artboards" checked or unchecked, and only seems to affect PNG export and not other file types.
I'm not sure what version this first appeared in, but I know that previous versions of Illustrator behaved correctly.

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Ton commented
Export for screens work as expected, export as makes the pixel amount 10 X smaller.
See: https://community.adobe.com/t5/illustrator-discussions/illustrator-2025-29-3-exported-pngs-not-original-size/m-p/15176172#M436243 -
zrowny commented
I just downgraded to check, and the scaling is correct in version 29.1. I wonder if the "Faster export to JPEG and PNG file formats" introduced in 29.2.1 accidentally introduced this bug
https://helpx.adobe.com/illustrator/using/whats-new/2025-2.html