It’s actually very easy to reproduce:
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Delete any active route
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Click the navigation arrow
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Activate follow mode
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(This looks good.)
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End navigation/follow mode (red button)
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Route is shown again.
If I then tap the back arrow (in the Android navigation bar), the route is immediately deleted. But if I restart navigation immediately by tapping the navigation symbol, naturally the route is active in follow mode.
Not sure if this error message has anything to do with it:
(This pops up after exiting navigation/follow mode.)