On a personnal project on https://todo.sr.ht/ at the "Labels" page, I've the list of labels. For each label, there is a "n tickets" link.
When I click on that link, I'm redirected to "https://todo.sr.ht/~myusername/myproject?search=label:"thelabel"" (the second """ is interpreted here).
If I remove the two """, the URL works.
I think the error come from here: https://git.sr.ht/~sircmpwn/todo.sr.ht/tree/a10b980692778cbc92fcad88d8ce5b2d2f0ad1e8/todosrht/urls.py#L46