(This topic is different from 404 when submitting a new site update)
When I try to update the following site update: https://exercism.org/maintaining/site_updates/365643/edit with the pull request https://github.com/exercism/prolog/pull/364:

I have a 404 page not found:

Here is a screenshot from the network tab, notice that it does a POST to https://exercism.org/maintaining/site_updates/365643:

Note that I did try to do the same POST to the https://exercism.org/maintaining/site_updates/365643/edit URL but this didn’t work.
References: