Bad Qt Quick application rendering when using QtWayland on i.MX6 SoC with Etnaviv driver

I am working on an embedded Linux system based on the NXP i.MX6 Quad SoC and build my Yocto project based distribution using Linux 4.16.1 and Qt 5.10.1 (from meta-qt5 layer). I am using open-source graphics (Etnaviv driver and Mesa 17.1.7), NOT the proprietary Vivante graphics stack provided by NXP.

I try to render a simple Qt Quick application as a Wayland client on top of the Qt Wayland compositor. The QML-based application (see ExpectedOutput.png) is supposed to show a simple red square inside of a white square (this is what I get on a simple Linux desktop PC build of the same application). However. the Qt Quick application (as seen in QtWayland_on_etnaviv.png) is rendered badly.

As far as I understand, this is because Qt Wayland compositor currently does not implement the unstable zwp_linux_dmabuf protocol described in this article:
https://www.pengutronix.de/en/2017-09-28-etnaviv-weston-mainline.html

I would like this issue to be resolved somehow so that the mainline kernel and open-source graphics stack become usable with the Qt Wayland compositor on the i.MX6 Quad SoC.