Hi,
We are using an open-source code to add dismissable admin notice. Once it hides, it will not show again before 45 days. In your case, I think other plugins have the same code (maybe an old version) or are using anything else to add a notice, which causes an issue with removing this notice.
can you please share the active plugin list?
Thanks for the suggestion! I have a lot of other plugins installed but I will experiment with this on a staging env and let you know. What open source library are you using for this?
Update: I don’t have any other plugins that use the PAnD library for those notices. But it turns out that I get a 403 error from admin-ajax.php when I try to dismiss the notice. This is almost certainly not your fault – you can probably close this thread.