TextInput does not get an accepted signal from QtVirtualKeyboard

In an internal project it was observed that the browser app in an QML UI allows to write a new URL, but there is no way to make it loading, since the Enter key in VKB seems not to work. In a later investigation, it turned out that the same issue can be reproduced with the KeyboardDemo app. The Qt Quick's TextInput does not get onAccepted signal at all. The focus of the TextInput is fine, but no signal arrives.