Incorrect indent for Clang-style lambda blocks

Steps to reproduce:

• Reset Qt Creator settings (rm -Rf ~/.config/QtProject/qtcreator)
• File > New File or Project... > C++ Class
• Inside the automatically-created constructor, insert a new line and type dispatch_async(dispatch_get_main_queue(), ^{ then press return, then type something (for example return;) on the next line.

The return; line is indented with 23 leading spaces. I would have expected it to be indented with 8 leading spaces — a first indent since it's inside the constructor, and a second indent because it's inside a Clang-style lambda block.

See also the attached screenshots of actual and expected behavior.