I looked a bit at the code and $du is not considered anymore, because the next hop address
is computed by the c function executed by various modules that send local requests. The
event route is executed later, when the transaction structure is already created.
So drop and considering new $du may be made features requests, but they may not be
feasible without major changes.
You can document the current behaviour as it is. In the future, when one needs changes in
this behaviour, then c code has to be contributed.
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