parameter forwarding (google analytics sessions)

Hello,

so I noticed that pretty link does something weird when it comes to paramter forwarding.

I set up cross domain tracking with google analytics (that links my domain and gumroad.com, the platform I use to sell my stuff). If I use the bare link, the session gets transferred fine (as I can see it on the appended userID in the url).

If I put it behind a pretty link, it does not work, even though the parameter forwarding option is turned on. could you help me what am I missing?

here is a test page with examples.

https://otevotnyelv.com/test45z3453z8/

Thank you!