canonical link - url scheme https is not respected

[DietmarBlue]

MetaSEO version: 2.1.0
TYPO3 version: 7.6.24
PHP version: 5.6.30

I have am multisite installation, canonical url is generated fine, except the URL scheme, which should be https and not http

This page
https://www.villa-postillion.at/de/service-infos/aktuelles-essen/

has a canonical TAG that uses http instead of https
<link rel="canonical" href="http://familienhotelpost.com/de/service-infos/aktuelles-essen/">

The link generation failes here:
\metaseo\Classes\Page\Part\MetatagPart.php Line 366
$ret = $this->cObj->typoLink_URL($conf);

[thomaszbz]

Have you tried plugin.metaseo.metaTags.canonicalUrl.fallbackProtocol = https?