Share Link does require Account Creation?

I have used share links to share conversations with friend before and it worked fine all of the time. Now my friends need to create an account to use the link? Documentation still says, that everyone with the link can access the conversation. And this is still true for old links - but not for the ones I created yesterday or today. Seems to be a bug from my perspective.
old link, still working:
new link, not working: