Undeterministic stuck while expanding thread objects

Hi there, I'm not sure if it's on my machine or a general issue, but while going through testQThread as in https://wiki.qt.io/Qt_Creator_ManualTests_DebuggerGdb , I've noticed that expansion of some thread objects makes "Locals" widget stuck and turn lighter grey, more like stuck in the loading thing. What was helping is sometimes to try to expand another Thread object, or make "Expressions" widget bigger, to overlap locals a bit, but it's not always the case.