Error: CordovaError: Failed to get absolute path to installed module

cordova-fetch@1.2.0

I have the following situation when building my cordova project from clean.  By clean I mean

rm -rf platforms plugins

So I have my config.xml prepared (which I generate from a template) and I sit in the project directory and I do

$ cordova plugin add https://github.com/redskyit/cordova-plugin-background-geolocation.git
$ cordova plugin add ../plugins/redsky-firebase

(the real commands include variables, but for purposes of reproducing this issue, they are not required)

The second plugin add fails with:
(where ... is /usr/local/lib/node_modules/cordova/node_modules)

Error: CordovaError: Failed to get absolute path to installed module
     at Function.getPath (.../cordova-fetch/index.js:203:15)
     at .../cordova-fetch/index.js:102:35
     at _fulfilled (${NPM}/cordova-fetch/node_modules/q/q.js:854:54)
     at self.promiseDispatch.done (.../cordova-fetch/node_modules/q/q.js:883:30)
     at Promise.promise.promiseDispatch (.../cordova-fetch/node_modules/q/q.js:816:13)
     at .../cordova-fetch/node_modules/q/q.js:624:44
     at runSingle (.../cordova-fetch/node_modules/q/q.js:137:13)
     at flush (.../cordova-fetch/node_modules/q/q.js:125:13)
     at process._tickCallback (internal/process/next_tick.js:150:11) 

I added a console.log to getPath in cordova-fetch index.js and the output is as follows:

$ cordova plugin add [https://github.com/redskyit/cordova-plugin-background-geolocation.git
getPath: /Users/adf/.../RMCv2/node_modules/cordova-plugin-background-geolocation
$ cordova plugin add ../plugins/redsky-firebase
getPath: /Users/adf/.../RMCv2/node_modules/cordova-plugin-background-geolocation

Thats right, the second plugin add is using the first plugins path, and this fails.

Further more, if I run the second cordova plugin add command again, it then works with getPath using the correct path this time.

$ cordova plugin add ../plugins/redsky-firebase
getPath: /Users/adf/.../RMCv2/node_modules/redsky-firebase

If I reverse the order in which I install plugins, it works ok

$ cordova plugin add ../plugins/redsky-firebase
getPath: /Users/adf/.../RMCv2/node_modules/redsky-firebase
$ cordova plugin add [https://github.com/redskyit/cordova-plugin-background-geolocation.git
getPath: /Users/adf/.../RMCv2/node_modules/cordova-plugin-background-geolocation