Quota_include_external_storage true and false makes no difference

Hi and greetings,

We installed Nextcloud with the Downloadable Virtual Appliance and mounted an external CIFS-Share. Plan is to force the users to store their files in the external share because of backup-policies and so on.
So I wanted to set the quota low because the default behaviour of quota_include_external_storage would be that external Storage is not adding to used quota.

But in our case this does not work - I have a quota of 1Gb and stored 100Mb in the external storage and am told that I used 100Mb of my 1Gb quota ?

Is this a bug or do I have to configure somethinadditional - we are on the latest stable 11