Upon installing and configuring MaxScale 2.3.2 we encountered errors when slave database (which has read_only=1 set). After investigating it looks like MaxScale is marking all queries as read queries. We have a previous installation running version 2.1.11 which we never saw this issue on. Not a single query was marked as write despite the write queries being simple inserts. Attached is a log that contains queries showing that they are flagged as read.