If a track is set to solo, the send busses / tracks that are connected via send device will be solo’ed, too, which is good. So you can hear the whole solo track with fx etc.
But if you now change the target of a send device in the solo’ed track, the new send bus/track won’t be auto-solo’ed (if wasn’t before).
Why not also auto-solo the send track on send device target change (if the source track is solo)?
Now you always have to unsolo and solo again, first. If you work on a solo track, is there any reason not to auto-enable the target send tracks even on change?