Firestore Database: Failed to load resource: the server responded with a status of 400 ()

I have an existing public firestorm database, no authentication and authorization needed. It works during more months, but today I realized the following error:

Failed to load resource: the server responded with a status of 400 ()

I see the following when I clicked to the error:

{
"error": {
"code": 400,
"message": "CONFIGURATION_NOT_FOUND",
"errors": [
{
"message": "CONFIGURATION_NOT_FOUND",
"domain": "global",
"reason": "invalid"
}
]
}
}


What has changed and why? (Nothing on my app page.) On my older site it works, why? (can duplicate this page and see the changes on the other page)

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