We have a wiki post at DNS providers who easily integrate with Let's Encrypt DNS validation - Server - Let's Encrypt Community Support that we’ve been using for a while. About 9 days ago, one of our TL4 users reported that they can no longer edit it. I can still edit it, but I’m an admin. As far as we know nothing changed with the post recently. One of our other admins tried closing and then reopening the thread to no effect.
As an FYI we have
post edit time limit set to 1440 after this discussion, in case that affects anything.