RAK7249 GPS not updating TTN v3

The GPS information is not received properly by TTN (no update on location)

RAK7249 with latest firmware (1.3.6_RAK b150)

LoRa® Server: TTN v3 (The Things Stack Community Edition)

The coordinates are displayed in the LuCi Interface correctly.
However, the coordinates are somehow not sent to TTN v3.
This functionality is needed by our client to help tracking assets.