I just got off the phone with the Wix support and they told me to post here because they officially don't support utm parameters yet 🙄
Anyway, here's the problem: if you go to https://www.exaas.de/product-page/auswahl-fertigungsverfahren/?utm_source=Test you will get a "Product not found error". Whereas if you delete the "/" before the question mark, the page works. I try to use the working url whenever I can, but some tools add it by themselves.
Is there anything I can do?