JSScripting error before rule engine started


I got a lot of errors like

ScriptEngine for language 'application/javascript;version=ECMAScript-2021' could not be found for identifier: 7d140c86-24d5-4d56-93db-f596a18d166c

before the log entry “Rule engine started”. It seems like everything is working fine, but ERRORs in the log are never a good thing.

I could resolve the issues by creating a variable which is set to ON once system run level has reached 100 and I am using this in the condition of my rules to be checked for ON (setting it to OFF in startLevel 20).

Is there another way to prevent rules to be executed before the rule engine is started? In the conditions there is no system started condition out of the box, but maybe there is a configuration which I couldn’t find so far?