Payload validation error: 'Additional properties not allowed: allow_online_access_with_ephemeral_sessions'

When accessing the following URL and trying to change the custom API settings, an error occurs and I cannot make the changes.

https://manage.auth0.com/dashboard/jp/ [ my-tenant-name ] /apis/ [ api-id ] /settings

Payload validation error: 'Additional properties not allowed: allow_online_access_with_ephemeral_sessions'.

If I click the save button immediately after accessing the URL, no error occurs.

However, if I change any setting (e.g., extending the access token expiration time by 1 second) and click the save button, the above error occurs.

After that, if I revert the access token expiration time to its original value and click the save button, the error still occurs.

Why?