External storage (S3) - NC 20 - used storage size not displayed correctly

Nextcloud version : 20.0.4
Operating system and version : CentOS 7.7
Apache ver: 2.4.6
PHP version: 7.2

Using S3 external storage, works fine, however the used storage displayed (both in bottom left corner and in settings page) is always 0 (except for the admin).

I only use S3 storage, no local storage (i.e. external storage mapped to /).

Setting quota or not doesn’t change anything, it shows “using 0B out of xxx GB”.

I’ve tried to rescan files, no change.

Any help or hint on what I could/should do?

Thanks

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