Wrong submodule referencing

[YuanZhu-apple]

Run git clone --recurse-submodules https://github.com/ResearchKit/GlucoSuccess.git

Cloning into 'ResearchKit'...
remote: Counting objects: 6296, done.
remote: Total 6296 (delta 0), reused 0 (delta 0), pack-reused 6296
Receiving objects: 100% (6296/6296), 13.89 MiB | 8.57 MiB/s, done.
Resolving deltas: 100% (4165/4165), done.
Checking connectivity... done.
fatal: reference is not a tree: 9c5d9966361547832ae8d7e5c5c2ec4dbe56b216
Unable to checkout '9c5d9966361547832ae8d7e5c5c2ec4dbe56b216' in submodule path 'ResearchKit'