Im using AWS MySQL Aurora, the current wait_timeout is 28800 which is the default one, and interactive_waitimeout is also 28800.
But I can see more than the default value.
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Ah! This one could be application framework has the value passed at the time of creating connection to DBs to set wait_timeout or interactive_timeout for their session level, this overrides default mysql settings.
If you enable general log on any test environment and have their application to point to that DB. You will find wait_timeout or interactive_timeout setting such values.
Short Term Fix: