Warning: keyword test expects a different set of parameters. Please update the operation parameters

I have a thousand tests that have been running fine for years but just now I upgraded to TC 10.60 and most if not all calls of a Keyword Test from a Keyword test give me the warning:

<keyword test name> expects a different set of parameters. Please update the operation parameters.

Nothing I do to the parameters in the calling test or the called test makes any difference. The release notes for 10.60 don't mention anything about calling tests from a test or operation parameters.

What has changed and how do I fix this?