New line in button -- not working

[zerothi]

Describe the bug

context
When I do a block new line in a button the | are showed verbatim!

expectation
I expected the regular rst to function.

.. button-link:: example.com
    :expand:
    
     | hey
     | new line

problem
The button contains the | characters, and no new lines are inserted.

Reproduce the bug

Create a button-link with the above code.

List your environment

sphinx-design == 0.5.0