Using Oneplus Nord N10, 20.04 OTA 7:
TL;DR - uNav freezes after location is acquired, Morph freezes upon clicking Allow in Permission Request for location, PureMaps will crash after location acquired the first time, then works well upon re-opening.
-uNav freezes reliably with GPS, seemingly after GPS position is acquired. It will freeze with "Waiting for GPS" still visible, but not immediately, I can still shift from light to dark mode for example, until suddenly I can't click anything in the app.
-Morph freezes reliably after enabling location on navigation websites (tried google maps and waze.) Specifically, I select "Your Location", Morph brings up the UT Permission Request to share location, I click Allow, the website says "Waze/GoogleMaps does not have permission to use your location", I repeat the process, and Morph freezes if I click Allow, with Permission Request still visible.
-in PureMaps' Navigation menu if I use Current Position and wait for the wheel to stop scrolling (position acquired), then click to enter a destination, the app will crash, not freeze. It just closes itself. But then if I re-open the app, I can do the same and it doesn't crash and successfully navigates. I've navigated long distances using PureMaps. I think it may have crashed unexpectedly during navigation once or twice, but generally it works for me. I can't recall it ever freezing.
Not sure why my experience is different, but I've spent some time testing and this all seems to happens consistently for me.