Before PROFILING you load one of the Rigs in your pool as a starting point. The effects of that Rig stay in the signal chain while you evaluate the new PROFILE and these effects are stored with the resulting Rig including the new PROFILE. So if "DLY+REV Routing" or its predecessor "DEL+REV Balance" were set to x% and were not adjusted before storing the new Rig, they - like any other parameter - ended up in the resulting Rig. That is intended behavior and no bug. Only the author knows, if this happened intentionally or accidentally. A few of our early factory Rigs had DEL+REV Balance set to +58% and other values. Some of these were obviously used as starting points during the creation of other PROFILEs. That's why we see this pattern. +58% is no default burnt into the software. However, such parameters can be changed at any time. And DLY+REV Routing only takes effect, if both modules DLY and REV are activated.
This general logic is not new. DEL+REV Balance +58% was "hidden" in the reverb module of those Rigs all the time. Now, since we migrated this parameter into Rig Settings under the new name DLY+REV Routing, it's just more visible. Yes, if you load another reverb preset it's not overwritten anymore like before. But we had to move it to a neutral place since the REV module can hold all effect types and the reverbs could be anywhere. That's why it ended up in Rig Settings.
We do housekeeping on a regular base including "normalizing" our factory Rigs. With 7.0 there will be a complete revision of all our factory Rigs. Setting DEL+REV Routing to neutral, where it has no practical effect, is part of the exercise.