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Thank you in advance for your patience and understanding on the matter.
Did you also upgraded from Debian 11 to 12? Or did you freshly install Deb 12 on the server? I am not sure if the issue is related to the one in the bug report if you are running a bare metal server. As the bug report only mentions containerized environments being affected. Even though the error in the bug report is similar to yours and there aren't any other issue's/reports I can find with the same error. But it might be.
As for fixing the issue manually, I am not sure to be honest. In the bug report downgrading to a previous version of procps gets mentioned. I'd be hesitant to try that on a production server.
If nobody else has any suggestions, you might want to conciser open a ticket with Plesk support. Maybe they can suggest a solution, even if it's not a Plesk related issue.