Stop remembering my last save as file type!!!
I've used Illustrator for decades, and the only file type that a new document should be saved as is an .AI file. For the love of God, please go back to .AI or allow me to choose .AI as my default file type!!!
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We have fixed this issue in latest version of Illustrator - v29.8.1
Please update your Adobe Illustrator and let us know your observations.