Hello @klickklack,
this seems to be the same issue as here, so I’m marking this post as a duplicate. I’ll mark this topic as duplicate and close it. We will update that topic once a fix is released.
The root cause is the space between echo and the function name, that you have {echo: wp_lostpassword_url()}.
There shouldn’t be a space between them, so, if you remove that space, it will work again. But, we will change this in next version, so that it will work with space again - just like before.
But for now, the only solution is to remove the space.
Best regards,
Matej