Cannot update RuboCop submodule - "reference is not a tree"

[andyw8]

I'm not too familiar with Git submodules, but when I run the command given in the README it fails with:

$ git submodule update --init --depth 1 vendor/rubocop
Submodule 'vendor/rubocop' (https://github.com/bbatsov/rubocop.git) registered for path 'vendor/rubocop'
Cloning into 'vendor/rubocop'...
remote: Counting objects: 830, done.
remote: Compressing objects: 100% (761/761), done.
remote: Total 830 (delta 172), reused 142 (delta 63), pack-reused 0
Receiving objects: 100% (830/830), 1.36 MiB | 366.00 KiB/s, done.
Resolving deltas: 100% (172/172), done.
Checking connectivity... done.
fatal: reference is not a tree: 1473da4b0c81e34548e452d4d3427623bdac16de
Unable to checkout '1473da4b0c81e34548e452d4d3427623bdac16de' in submodule path 'vendor/rubocop'

[andyw8]

Ping @nevir, @nijikon – any luck reproducing this issue? I'm trying to figure out if it's something specific to my machine.