ROCK Pi 4 Kiosk - Ubuntu Frame

Hi, I am trying to set up a ROCK Pi 4b as a kiosk, with the 7" touchscreen.

I have installed the Debian 10 image, updated all packages and enabled the 7" display overlay. The display works and desktop is displayed.

I then install snap:
sudo apt install snap

And install Ubuntu Frame:

sudo snap install ubuntu-frame
sudo snap install core

Then wpe-webkit-mir-kiosk:

sudo snap install wpe-webkit-mir-kiosk
sudo snap connect wpe-webkit-mir-kiosk:wayland

Set URL and daemon to true:

sudo snap set wpe-webkit-mir-kiosk daemon=true
sudo snap set ubuntu-frame daemon=true
sudo snap set wpe-webkit-mir-kiosk url=

Ubuntu Frame appears to launch correctly as I see the faded-grey screen.

The kiosk does not load. In the snap logs I receive a SEG FAULT as per this issue:

Using a previous version of that Snap shows a different error:

2022-01-06T02:43:09Z wpe-webkit-mir-kiosk.browser[665]: EGLDisplay Initialization failed: EGL_NOT_INITIALIZED

Can anyone suggest how to resolve this issue?