I meant for the recent updates like 3.2.5. The issues there are all very old.

It also doesn't work for me, I just see the "Create Issue" button loading continuously, can't get passed the first step.

Where do you see that? I see how that website leads to their Gitlab instance.

https://gitlab.gnome.org/GNOME/gimp/-/work_items

Of the items there which are actually tagged with a version number, they are all recent versions:

I'm not creating an account, so unless I see an error about requiring an account there, I won't make one.

That is certainly a concern with formal bug reporting for any software project. It requires you to create an account with whatever git service that the project uses (GitHub, Codeberg, Gitlab, etc.).