It’s coming! 
Interesting. This update to MySQL 5.7 has thrown a number of challenges our way.
So from the log, it looks like the “Gutenberg” site is being cloned. I can’t tell from the log – was this site started as a Preferred environment and then you are cloning it to a custom environment?
When you open up “Adminer” for the original site, are there extra tables that exist beyond the typical WordPress ones?
http://flywheel.link/865759672e4b
If there are, I would take a backup of the DB, and then try dropping the non-wp tables and then try to clone again. Let me know what happens.
– Ben