Element not installable on Glitch

[tomalec]

Description

I was trying to use glitch to showcase a bug in paper-dropdown-menu but I'm not able to as paper-listbox installs corrupted in glitch. After running bower install paper-listbox on glitch bower_components/paper-listbox seems corrupted, see

Doing bower install paper-listbox --force does not help

Expected outcome

paper-listbox should be installed, bower_components/paper-listbox/paper-listbox.html should return 200

Actual outcome

paper-listbox is theoretically installed, bower_components/paper-listbox/paper-listbox.html returns 404

Live Demo

https://glitch.com/edit/#!/ossified-scarer?path=bower.json:6:29

Steps to reproduce

1. Open glitch
2. Install paper-listbox either from console, or via bower.json
3. Put <link rel="import" href="bower_components/paper-listbox/paper-listbox.html"> in index.html
4. open preview

Browsers Affected

n/a