It's been also reported in Ubuntu[0] that it doesn't document the proper exit status:
DIAGNOSTICS
Exit status is 0 if whiptail is exited by pressing the Yes or OK but‐
ton, and 1 if the No or Cancel button is pressed. Otherwise, if errors
occur inside whiptail or whiptail is exited by pressing the ESC key,
the exit status is -1.
However it's not possible for a Unix process to return exit status -1. It
returns 255, as confirmed by
whiptail --yesno Wibble? 7 50; echo $?
then hit ESC.
Maybe when fixing the other issues it may be updated as well to change -1 for
255 in the man page
[0] https://bugs.launchpad.net/ubuntu/+source/newt/+bug/1010534
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