This issue was introduced somewhere after Qt Creator 4.7.0-beta1 (4.6.82) | Built on Mar 21 2018 05:24:41, probably due to a new version of clangbackend? Not only symbols of such expressions can't be followed (F2) it also prevents some context-related auto-completion suggestions to appear, comparing to older versions of Creator. It's pretty important, because when you type an expression it is not always valid until you type the every last bit of it.

As another side effect, that is a regression from 4.6: symbols under cursor are not highlighted, even in 4.7.0-beta1 (4.6.82).

All examples attached as images.