Nimble caches the package list locally in $nimbleDir. That's why you see `/home/user/.nimble/packages_localpackges.json`. See [here](https://github.com/nim-lang/nimble/blob/f4c818a046c2c3ceb1523c4c974e4b6e625d8ca3/src/nimblepkg/packageinfo.nim#L179). You can verify that this file is a copy of the original you provided.
Is localpackage defined in your packages.json?
