Sorry, no reputation to comment. In reality it's just a remark for weird behavior.
On iOS I have grey - useless - screen in Here WeGo app with here-location://LAT,LON
if the here WeGo app is closed. If it's opened and THEN I engage here-location://LAT,LON
url schema everything is fine. Of course this is not a solution.
The solution is https://share.here.com/l/LAT,LON
* as stated above or first open the app, then trigger the here-location://
URL schema but this is bad experience.
* but maybe this means that it works only on-line and not off-line?