The URL https://makitech.no/ventilasjon/ventilasjons-pakketilbud was correct on the 05.02.2018 (google cache time) and did at this time not have any rel canonical set. When looking at the Google cache all i se is a white page, but when clicking on "view text-version" and "view sourcecode version" i se the content. Not sure why google cache shows only a white page on "view full version".
Quote: "the more redirects you have in place, the slower the load times get".
The way it's working now, there is no redirect. The shop is fetching the correct content but serving it on the "old/wrong url" instead of doing a 301. But it appends the rel canonical to the correct url.
So i'am wondering if this is okay seen from Google's SEO eye