TWIG and "lowQualityPlaceholder": true


i can’t get the SQIP lowQualityPlaceholders to work.
does anybody have any experiences with that?
implemented them as
{{ pimcore_image("logoImage", {"class": "area-logo-bar__image area-logo-bar__image--grey", "thumbnail": "logo-bar-logo", "lowQualityPlaceholder": true}) }}
the CLI-Command also behavious weird:
php bin/console pimcore:image:svg-preview
it removed the “filetype-not-supported.svg” in the Pimcore-Bundle and then stops with an warning that this exakt image cannot be unlinked…