Steps on Android 10:
1. Clear app cache.
2. Launch the app.
3. Observe portals around not loading for a few seconds (in reality there are portals right in the view).
Actually you don't even need to clear cache, just don't launch the app for a few minutes and it will load portals very slowly during the next launch.
This happens to me also.
This is still an issue on 2.56.
This is still an issue on 2.58.1-8bd4a619
For completeness, also an issue on 2.57 :-D
This is still an issue on 2.59.2-e5b3ddf8