Qt Virtual Keyboard doesn't work with weston

1. Start weston on an embedded device
2. Start the basic Boot2Qt demo appliction
3. Tap on the input field

It gives the following message:
"qt.qpa.wayland: qtvirtualkeyboard currently is not supported at client-side,
use QT_IM_MODULE=qtvirtualkeyboard at compositor-side. "

With weston it doesn't work neither on compositor side, neither on client-side.
This change may caused it:
[https://code.qt.io/cgit/qt/qtwayland.git/commit/src/client/qwaylandintegration
.cpp?h=5.13.2&id=3aedd01271dc4f4a13103d632df224971ab2b6df |https://code.qt.io/cgit/qt/qtwayland.git/commit/src/client/qwaylandintegration
.cpp?h=5.13.2&id=3aedd01271dc4f4a13103d632df224971ab2b6df ]

Note: it works on the client side if physical keyboard is present.