Create Branch "Branch From" hidden with CSS ( GitHub )

[Rob]

When creating a branch from Jira using GitHub, the "Branch from" selector is hidden using css.

It shows before selecting a repo, but when selecting one, the selector is hidden by a global styles. 

Here is the actual CSS on the "global.css" - It has a small note... but no real indication.

After making the selector visible, the functionality works as expected. However, we want to make sure we're not bypassing a critical feature, or if it was hidden on purpose, why? Are we in danger of any security issues by un-hiding the selector and proceeding to select the branch we want to branch from?

Thanks all.