Thanks for the information provided to the Illustrator team.
We are able to reproduce this issue at our end and the engineering team is currently isolating this issue further to get to the root cause.
With Best Regards,
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I just fixed my problem. Apple OS shortcut for Siri is the spacebar. Go into preferences and turn off Siri or change the shortcut. Once one you will be able to use the spacebar in Illustrator for the hand tool.