Moving Tor Browser onto SD Card breaks app on Android

We received a report that the app breaks when it is moved onto an external SD Card (or additional storage partition).

 - Einstellungen im Tor-Dienst werden aktualisiert
 - updating torrc custom configuration...
 - success.
 - checking binary version: 0.3.5.8-rc-openssl1.0.2p
 - Orbot startet ...
 - Unable to start Tor: java.io.IOException: Cannot run program
 "/mnt/sdcard/org.torproject.torbrowser-1/lib/arm64/libTor.so" (in
 directory
 "/data/user/0/org.torproject.torbrowser/app_torservice"):
 error=13, Permission denied

It seems like tor-android-service is expecting a relative path for libTor.so within the app's local storage, but it is receiving an absolute path somewhere else.

Moving Fennec onto an sdcard works, so we can see how geckoview loads libxul.