I am setting up my build environment by using the plugin to install node 16. In my first shell build step, I output `node -v` and `npm -v` and see the following

22:31:29 + node -v
22:31:29 v16.20.2
22:31:29 + npm -v
22:31:29 8.19.4 

Looks good.

But then my gulpfile runs, which looks in multiple sub folders, and if there is a package-lock.json file, it runs the command

npm --prefix ' + filePath + ' install ' + filePath + '/ --production 

This works for 99% of my jobs, but for one job recently, something odd has been happening.

The npm version that is used to run the command turns out to be v6.10.0, which modifies my package-lock.json files to lockfileVersion 1, and lots of packages are not installed.

What would cause this to happen all of a sudden?