Weston error EGL 0x3002

Hi All

I have a Qt 5.15 application running under Weston Wayland on Yocto Linux. It contains a Qt virtual keyboard on a popup dialog (application-modal), which generally works fine.

When I run the popup on a 4k monitor, or try to maximise it on a regular 1920x1080 monitor, the popup becomes a black rectangle, sometimes with a white flickering rectangle where the virtual keyboard should be. When this happens journalctl records:

Feb 27 15:27:32 jetson-xavier-nx-devkit-tx2-nx weston[5632]: [15:27:32.512] failed to set stream consumer

Feb 27 15:27:32 jetson-xavier-nx-devkit-tx2-nx weston[5632]: [15:27:32.512] EGL error: 0x3002

Any advice on how to proceed would be appreciated!