Don't use "race day" feature with Garmin coach. GPS was 300meters off and ended the race early.

The race was a "Super half" marathon and World Athletics gold label measured distance. 

I used the race day feature in Garmin coach but the GPS ended up being 300meters/1000 feet off and end the race before the finish line. 

I want to use the official time for my activity and not the Garmin. This also syncs the wrong data to Strava. So frustrating.