I go into Deployments > Settings and select “Use the version number from an included package”. I then select a package step from the dropdown and click the Save button. The “Release Versioning” section is automatically collapsed. When I expand it again the “Versioning package step” value is blank. I think this is a UI only issue as the versioning seems to be working OK.
This is similar (but different) to "Package Step: Not found" after selecting trigger - #3 by paul.calvert and Versioning package step not displayed correct on project --> Setting web portal page