ETE keeps counting up in NAVIGATE with COURSE

Hello,

While testing my new Fenix 5 watch in the car while standing in a traffic jam i encountered what i think is a bug.

To be short:

I started a 'Navigate'-activity with a saved location as destination and noticed that the ETE time was constantly going up (unrealistically). 50+ hours for a 15 kilometers.
Even when i got moving again (+100km/h) it still was only going up, never down.
I stopped this activity and started a few others with the same destination (hike, run, track me) but there the ETE and ETA was realistic and adapting to my speed.

I started the navigate-activity again to the same destination and kept encountering the same issue, so i went into the settings and changed the navigation type to BEARING instead of COURSE.
After this the ETE and ETA were realistic and not constantly going up.
I tested a few other cases but as far i can tell it ONLY happens in NAVIGATE-activity with the navigation-type set to COURSE, so i guess it has something to do with the calculation of the ETE when going 'OFF COURSE', even for just 100m or so.
When i change the navigation type back to BEARING, and re-select the saved location as destination it is OK again.

The pictures included are showing that i am 1km or less from the destination,( i was driving with a speed of about 30km/h) getting closer to it, but ETE only was going up.

Did someone experience the same kind of issue? ciq.forums.garmin.com/.../1451983.png ciq.forums.garmin.com/.../1451984.png