[Reg -> 4.15] QTest Application Output often not scrolling to end of output

I often run QTest tests with Ctrl+R and just watch the application output.

I noticed recently, that often the Application Output just shows the "Starting ..." line, but does not scroll to the end of the output. E.g. it just happened with Qt Creators tst_lexer unit test.

Maybe that is related to the fact, that the unit tests run very fast and/or no flushing happens?