I was expecting the 2 combined queries either to be separated in individual queries "SELECT data FROM Stuff WHERE id = ?" or in one large queries with three ?, but not the above result...

Oops, I forgot the attachement, see repeat script on 9.6.1

After some quick investigation, I concluded that the issue is that the whole combined query string is used instead of the part refering to the actual query being processed.

As a result:

 - the full un-normalized string is used for both BEGIN & COMMIT
   => n shared entries, one for each actual query, begin & commit are mixed 

 - the fist-part only normalized string is used for each SELECT
   => 1 shared entry with "query" is the first partially
      normalied encountered combined query


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