The app Osmand uses TTS for the voices.
On /e/ there is no Google TTS (Text To Speech).
Workaround is to install Flite TTS Engine (available through F-Droid) or PicoTTS rather robotic-sounding.
There is also MaryTTS (Open Source http://mary.dfki.de/ MaryTTS supports German, British and American English, French, Italian, Luxembourgish, Russian, Swedish, Telugu, and Turkish; more languages are in preparation.
As MaryTTS doesn’t have Dutch I haven’t tried it.
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OsmAnd can talk without TTS, too, for a quick workaround …
After applying update 2020062560240 the problem with the sound is gone.
Osmand is speaking Dutch now.
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