My partner has Navigator v7.2.60 with OSM maps running on an Huawei MediaPad M5 with Android 9 and is unable to save routes. I tried this on my Honor phone running Android 10 and experienced exactly the same issue.
I also have a Samsung tablet that I usually us when touring in my motorhome v7.2.43 (Truck) with Android 7.1.1 but have no issues.
Is this a problem with 7.2.60 or some sneaky thing with Huawei/Honor?