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WCAG and incorrect implementation of keyboard interaction

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From: konstantin galiakhmetov
Date: Mar 13, 2019 5:20AM

hello,
What SC i can mention when i see that a keyboard interaction with a ui
control is implemented in the wrong way.
For example there is a drobdown list  and a user has to press tab key to
move to the next item. My user experience says that i must use arrowkey
to choose an option in the drop-down list, not tab key, and i am sure
that this implementation is not correct, but i can not cite a 
particular SC  because WCAG does not regulate specific implementation.
What should I do in such cases? How can I prove that this implementation
is a major problem? Or I'm wrong and above described behavior is not
critical issue?

--Sincerely, Konstantin.