Project edit fails to return to project page after Save

When I add a new observer rule to a project with Chrome 90, and I press save, then I expect to be taken back to the project page. Instead, it waits for 60 seconds and then times out, popping up this dialog box:

I edited a second project rule to measure the exact time & capture any messages from console. This is what it reported:

Access to fetch at ‘’ from origin ‘’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled

When I navigate manually to the project page after that, I can confirm the new observer is successfully saved in the rules.


Oof, we use this pretty much daily.