After (successfully) building the debugging helper inside the Options dialog (Build & Run -> Qt Versions -> Helpers) by pressing "Build All" some of the buttons do not get enabled again.

Windows:
"Build All" stays disabled (rest seems okay)

MacOS:
"Build All" and "Build" (QML Dump) stay disabled (rest seems okay)
(Build for QML Dump is disabled on Windows too, but there it's saying "Cannot be compiled." So, this should be ok)

Linux:
Same as on MacOS