There are hundreds of topics on this issue. Of these, in many the user claims that the problem (neither this, nor this, nor this) … Then he discovers that it is one of the problems already reported in topics here in the community.
Well… Sorry !
I did see the quoted topic but… After posting this one
That’s quite strange that Google simply forgot to add this line to every google-services.json, there should be a reason (SDK upgrade so it is not required anymore?) and maybe the component needs to be updated to fix this.