Predictive text (TextInput or QLineEdit)

Predictive text in TextInput doesn't work properly (also when using QLineEdit) When typing words on keyboard, first character behaves normally (usually small letter) but all others are in uppercase. If i try to press done button on keyboard or tap anywhere else to hide keyboard, there will be no text changes in input, to avoid this i need to choose one of predicted words or type "space" characted after word. Only by that way i can get correct "text" parameter in my app. I really need predictive text so using Qt.ImhNoPredictiveText flag isn't solution for me