today i decided to rename my project a bit and discovered that Curse decided to re-arrange the URLs too... ???!!!
it used to be that Curse was using the addon folder name as url slug... apparently this is not the case anymore and any small change to addon name will cause a new url to be formed and auto-assigned. OUCH. Please add a warning about this url change in the project settings interface, next to the addon (re)name field.
i see that the curseforge redirect from numeric project id to the new project url has been fixed but the old url is still not redirected to the newly assigned url (still getting 404 on the old curseforge url of the project)
i assume that redirecting the numeric id (86550 in my case) to the correct project url is a script that runs automatically once a day or so and updates the redirects from numeric IDs to correct project urls... am i right?
if so.. that means that the issue tickets are not solved yet, but at least the link from curse to the curseforge project page works now. :)
update: i stumbled on an even OLDER bookmarked link, from before the transition of the curseforge site to the new platform and discovered that the rename process actually added a redirect for the OLD legacy (before-site transition) style link... but not for the after-the-transition style link