This bug came from the renderMenu function in shinydashboard package, and it was fixed on July 19th: https://github.com/rstudio/shinydashboard/commit/0694bcb2f2bbababd5c603dd8fea41d0f6348e9f
All we need to do is to re-install the package from github...
Nice! Great job @chelsyx! I was so frustrated when the thing supposed to work but didn't.
@debt: We'll need a separate ticket to re-install the shinydashboard package once they upload the fixed version to CRAN because we want to avoid using development versions of packages in production and we might forget. I'm not sure whether to create a "subtask" from this one?