What is a gradle-installation-beacon?

The gradle-installation-beacon-7.4.2.jar file end up in my docker image built with jib plugin along with gradle-api-7.4.2.jar and a bunch of their dependencies.
And I don’t see where those came from.
They are neither in gradle dependencies output nor in a buildscan.
They are in build\jib-cache\jib-classpath-file though.
Pls help

I guess there shouldn’t have been a kotlin-dsl plugin in my project