PHP 8.x Causes Gantry to Fail

[thekenshow]

On PHP 7.3, with Gantry and Grav updated to Grav v1.7.48 + Admin v1.10.48 (and all plugins updated to latest stable) everything seems to be working fine.

When I move to PHP 8.0_+, however, Gantry errors begin. For example:

{% block head_application %}
    {% do gantry.platform.finalize %}
 
    {% block assets deferred %}
        {{ assets.css()|raw }}
        {{ assets.js()|raw }}
    {% endblock %}
 
{% endblock %}
Arguments
"An exception has been thrown during the rendering of a template ("Trying to access array offset on value of type null")."

The only PHP specs I can find on Gantry.org are at:

https://docs.gantry.org/gantry5/basics/system-requirements

Which states PHP 7.1.3+.