I have integrated Firebase to my app and using it for some time. I was getting similar first open result as iTunesConnect until 2 weeks ago. For 2 weeks I am getting weird analytics. Even my daily new download is about 500-600, Firebase Analytics says I get 10-20 first open. I didn't change any settings in Firebase or didn't update the app. All same. What happened recently to Firebase?
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There was recently a bug on the iOS side of things -- it started sometime around the last week in January -- that was under-reporting first_open events. It has since been corrected (via a server-side fix), and you should start seeing normal first_open
results again. Sorry for the inconvenience!

Todd Kerpelman
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