Stumbled upon this weird error tonight while adding some comments to my code.
When the autocomplete box is showing code comments, it seems to treat the letter T (upper- and lowercase) as it would treat leading whitespace and hides it.
It only seems to hide it until a different character is inputted. (Exactly the same behavior as leading whitespace)

This seems to be completely reproducible.

I created a clean c++ workspace, and added a clean c++ project.
I added a function, gave it a comment, and started the brief with the letter "T"
When attempting to see the comment from the autocomplete box, the leading T is not present.

Attached is a screenshot demonstrating the issue.