Canonical setting on product detail pages has no effect.

[sixtmedia]

When trying to adapt the canonical to the URLs of the product variants (sitemap.xml), I realised that the canonical settings have no effect.

I wanted to release the parameters so that there is no mismatch between the canonical and the sitemap URL when the sitemap.xml links are called up

In this case, the product reader is integrated on an extra page. Neither the canonical settings on the product detail page nor a setting on the category page have any effect on the canonical-Tag when the product details are displayed.

Is this an error or do I have to make the settings elsewhere?

Contao 4.13.35
Isotope 2.8.17
PHP 8.1

Contao community thread with test and screenshots
https://community.contao.org/de/showthread.php?86163-Isotope-Varianten-in-der-Sitemap-xml-und-Canonicals