Pixmap cursors not supported on QtWayland

The QtWayland QPA plugin seems to not support pximap/bitmap cursors.

E.g. use something like pseudocode:
QWindow *w; // some QWindow
QImage c(QSize(24, 24), QImage::Format_ARG32);
c.fill(Qt::red);
w->setCursor(QCursor(QPixmap::fromImage(c)));

This will not result in a cursor, but in a debug message:
"Could not find cursor for shape 24"