Question for the devs about the Google Health/Fitbit integration

Overall, the fitbit/google health integration is great. But I was wondering if any developers could go into details about the limitations on Google's side that only allow for the calorie burned to sync late in the day (usually around 8:30 pm in my experience)

Other apps like health sync are able to write throughout the day BUT I end up with an insanely high active calorie burn amount if I use it. On the other hand what I get in Bevel seems a lot more realistic.

I'm just curious to know more about it works under the hood if someone is willing to share