Interesting thing... this fix corrected the issue for me as well but I noticed something strange after the fact. When you look in your data inputs in the GUI after you change tcp: to splunktcp: it appears that you have no TCP data inputs. Also, after making this change and restarting Splunk I did see a startup warning/informational message about a "possibly typo" in inputs.conf.
Everything works now, just two weird things I noticed afterward.
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