Issue #8707 resolved
Git submodules with a , in the path name will cause problems displaying in the Bitbucket UI (BB-9811)
If a Git submodule has a pattern similar to the below, the Bitbucket UI will show a 500 error.
[submodule "something,sub"] path = something,sub url = email@example.com:testuser/something.git
This is due to the comma. The only workaround at this time is to not use a comma in a path for a submodule.