Mail app is only syncing 3000 emails

The Mail app for my iPad and iPhone is only syncing a total of 3000 messages from my gmail account. Strangely it syncs a handful of the most recent emails but the bulk of the 3000 are from 10 or more years ago. There is no issue with the Mail app on my MacBook Pro - on the laptop all messages are synced. There is also no issue with the Gmail app on the iPad or iPhone, which syncs all messages correctly.

All software is up to date. I have tried deleting/re-adding the account multiple times. Each time only 3000 messages sync.

Is there a way to make the iPad/iPhone Mail app sync all messages? Is this a bug in the new iOS?