I can confirm that this also happens exactly this way with nodejs 7, and only on Windows Server 2019 slaves. This does not happen on 2008, 2012, 2016 or Windows 10 (I have a matrix job with all of the above).
Deleting tools\jenkins.plugins.nodejs.tools.NodeJSInstallation did not help.
- Jenkins 2.174
- NodeJS Plugin 1.2.7