Editing GPX trace properties via web form has no effect

[danstowell]

I uploaded a GPX trace to OSM. Present at http://www.openstreetmap.org/user/mcld/traces/2402245 . I click on "Edit this trace" because I want to change the visibility setting. This takes me to http://www.openstreetmap.org/trace/2402245/edit as expected. I change the visibility dropdown, I press "Save changes" - this seems to take me simply to the trace's .../edit page again, and no change in the GPX metadata has occurred. (Similarly if I alter the description.)

(I'm using firefox 53.0 on ubuntu 16.04)

When I submit the form, it submits to .../edit and the post content is

utf8=✓
_method=patch
authenticity_token=kjsKlyz8zWleBkZaKoUAYtMpJbcqfiNIMGIGn3UXz1BBzg==
trace[description]=homerton+addr+surveying
trace[tagstring]=walk
trace[visibility]=identifiable
commit=Save+Changes

(...although I've mangled the authenticity token in case it's sensitive.) The reply to the POST is simply 200 OK.

[danstowell]

👍