Do that and try again:
pkgman ins librsvg
rm -rf /boot/system/non-packaged/data/mime
rm -rf /boot/home/config/non-packaged/data/mime
gdk-pixbuf-query-loaders >/boot/system/settings/gdk-pixbuf-2.0/loaders.cache
But I would suggest adding my repository (https://haikuware.ru) and update/install gtk apps:
pkgman add-repo https://www.haikuware.ru/repo/lote
pkgman full-sync