Thanks to your fiddle I got it. The problem was that this file was located and loaded locally in the project that I'm working on: <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js";></script> So it was the outdated version. Now I'm loading this file directly from this URL and I'm passing the maps key as well and there are no errors nor warnings. Thank you very much!
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