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We had the same issue with our 2021 385MBR. I removed the bulk head in the storage compartment to see behind the convenience panel. I traced the black tank flush line to underneath the bathroom sink. It connects to a valve there and retraces back down into the chase below the main floor. It is supposed to go to the black tank from there but ours goes all the way forward to the kitchen grey tank. I proved it when our front tank was emptied but the sensor showed 2/3's full. I ran the black tank flush and the panel changed to empty on the front grey tank. During our 1 year warranty inspection I mentioned it and they assured me it was plumbed correctly. Now I know what type of service department I'm dealing with in Tacoma and won't return.
Side note: I only dug into the chase behind the panel after researching many different threads on this site. Sometimes it's hard to find but thanks to all those that made it possible for me to find and diagnose my own rig.
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