I have to admit, that I can see the point of Moritz' answer. When he fires the statements without using DBI he gets the same result which you don't expect and think of being the fault of DBI. At least there is a case where you get the same - in your view "wrong" result - without using DBI. This is a hint that the problem is not DBI related, isn't it? IMHO a valueable hint.
Now my hint: There are many variables in MySQL which have a session scope or a global scope. So, without digging deeper I think you change the session transaction level but ask the schema for the global variable.
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