Setting statusbar-h-padding or statusbar-v-padding has no effect

Running commands like :set statusbar-h-padding 30 or :set statusbar-v-padding 30 have no effect. Changing these settings in zathurarc also have no effect.

Version info:

zathura 0.4.0
girara 0.3.0 (runtime: 0.3.0)
(plugin) djvu (0.2.8) (/nix/store/b75pyhs07dl7r6prpaa3bvz19ywh4hmn-zathura-djvu-0.2.8/lib/zathura/libdjvu.so)
(plugin) ps (0.2.6) (/nix/store/32335lf2c9imwdiwn9zz19wbzc25jz2p-zathura-ps-0.2.6/lib/zathura/libps.so)
(plugin) pdf-mupdf (0.3.3) (/nix/store/4nqzjjykimw3xi1cnk3i9j3pbqz3azgr-zathura-pdf-mupdf-0.3.3/lib/zathura/libpdf-mupdf.so)

(I'm on NixOS if that helps, but I've confirmed this behaviour with others on IRC.)