I did a trace log and when I save a new SO with a Line, it only saved on the OrderDtl table and not the OrderRel table. It’s odd since I do see an Order Release line being created so I would expect it to create the OrderRel table also upon saving a new SO.
The 1st OrderRel is created silent, deep in the core in a Data Trigger, it fires no BPM, is disguised as part of the OrderDtl creation. You are not crazy. Somehow that change came with 10.1.400+
The only way to capture it is to monitor the Added of OrderDtl and in a Post-BPM you can then find the Db.OrderRel