The PowerShell plugin was updated to work with PowerShell Core pre-release version.  However, before ship of PS Core 6.0.0 the team renamed the binary from powershell to pwsh.  I have created a PR to fix this - https://github.com/jenkinsci/powershell-plugin/pull/9

There doesn't seem to be much activity on this GitHub repo.  Just wondering if someone is monitoring PRs over there.  If so, it would be great if you could accept the above PR and push a new version of the plugin.

BTW given that the plugin will then really support both Windows PowerShell and PowerShell Core.  Perhaps we should consider renaming the plugin (and the step title text) to simply "PowerShell"?