FID rotate unexpectedly with daily active user

[b95505017]

According from Document:

Here are some cases where FIDs could be deleted or rotated:

• Uninstallation or reinstallation of the app, for instance when an end user installs on a new device.
• The end user clears the cache of the app or the device.
• FID deletion is triggered in the backend due to app inactivity (currently the threshold for this is 270 days of inactivity).

We use FID as the base of database encrypted key by its lifecycle (only if user reaches three cases above). But in reality, our daily active user still may face to FID rotate unexpectedly, thus database decryption failed.

For a daily active user, is there any other reason causing FID rotation?
I face this issue as well after updating app through Google Play. Just use our app normally a hours ago.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.