iconicThumbnailPixmapRequested and iconicLivePreviewPixmapRequested are always sent

Even when explicitly disabling signals with setIconicPixmapNotificationsEnabled(), the two signals above seems to be emitted.

Therefore, if only one of the two setters is not called, like setIconicLivePreviewPixmap(), a glitch occurs: Windows is expecting to load something are cannot do it. One cannot see the original software with Alt-Tab or with mouse cursor.

See screenshot in attachements.

How one can set only a QPixmap with setIconicThumbnailPixmap() and nothing more?