Issue using branches with subtrees

[acouch]

When I try to build with https://github.com/DrupalLadder/_rhymessite as an example I'm not able do successfully run buildmanager-build. To recreate:

git clone git@github.com:DrupalLadder/_rhymessite.git
cd _rhymessite
drush buildmanager-build

I get the following error. Any suggestions?

drush buildmanager-build
Loading configuration from: buildmanager.config.yml                                                                                                                                                  [ok]
Using build file: build.make                                                                                                                                                                         [ok]
Preparing to add/update git subtrees.                                                                                                                                                                [ok]
Preparing to symlink rhymesdistro to path: docroot/profiles/rhymesdistro                                                                                                                             [ok]
The version/tag specified by your build.make file does not correspond with tags available at the remote we're pulling from.                                                                          [error]
Review available tags like this:
    drush subtree-get-tags rhymesdistro
Or see if you can spot a mistake in your make file or buildmanager config here:
    project:    rhymesdistro
    tag:        7.x-1.1
    remote:     https://github.com/DrupalLadder/rhymesdistro.git
fatal: bad object 988a20d93bb8e712e41224370133b9725c17e91a
Array
(
)

                                                                                                                                                                                                     [error]
Sorry. Git subtree split failed. Couldn't retrieve HEAD.                                                                                                                                             [error]
No Tag Found:   local version of rhymesdistro,                                                                                                                                                         [ok]
7.x-1.1:    build.make version of rhymesdistro                                                                                                                                                          [ok]
Preparing to pull subtree: rhymesdistro                                                                                                                                                              [ok]
No commit ID specified for rhymesdistro (if a tag was specified in a make file, the corresponding commit ID could not be retrieved). Your install will run on the tip of whatever branch you checked [warning]
out. (Subtrees do not fallback to the latest recommended release on drupal.org when no version is specified.)
Preparing to symlink rhymes to path: docroot/sites/all/modules/rhymesdistro/rhymes                                                                                                                   [ok]
fatal: bad object 2606dd6fd1e7804e26331f7b9cb3e025441d8332
Array
(
)

                                                                                                                                                                                                     [error]```