I'm used to create labels with slashes on its name, to group by category/type of labels, but than I cannot edit them since SourceHut will return an 404 (I believe due to incorrect escaping of the label name in the URL).
I expected to be able to edit labels with any permitted name.
Create a label with a forward slash on its name, e.g.,
kind/bug. Try to edit it by going to todo > labels >
kind/bug > edit, an 404 page is shown.