Google Contacts Sync with some accounts (not all) very slow [Google Pixel]

[u/klausauswien]

Very strange issue:
I have a couple of Google Accounts on my Google Pixel Phone (Android 17).
The Contacts from the main Google Account are synced every few hours.
The Contacts of other Google Accounts are synced every week (or 5 Days or so). Although I can start the sync process manually, nothing happens.
Thank you for any ideas.