In a comment, Google said ‘Access to details and links for errors may be restricted until the majority of users are notified. We will also retain restrictions if the bug exists in a third-party library on which other projects are similarly dependent but have not yet been fixed. As a result, we do not know what use it is linked to, but ZDNet notes that the timing is close to revelations about a campaign carried out by North Korean hackers aimed at security researchers, who may have relied on the zero-day use in Chrome and Internet Explorer.
No matter where or how the error is used, you will still want to update your browser (and you should immediately pay attention to other software that may be affected, such as other browser on Chromium). As ZDNet and BleepingComputer noticed, this happens sometimes. A striking solution in 2019 needed a reboot to implement the fix, and there was a record last fall in which Google addressed five zero days within one month that are actively exploited.