Looping through an assets field type within a matrix field that's eager loaded
Eager loading an Assets field simply means that instead of block.sectionBlockImages returning an ElementCriteriaModel, it'll return an array. This means that you can't do stuff like block.sectionBlockImages.first(), but have to use brackets notation – i.e. block.sectionBlockImages[0] to access the first Asset.

Looping over the field would look exactly the same, though. So you'll need to change this

{% for images in block.sectionBlockImages %}
    {% set image = block.sectionBlockImages[0] ?? null %}
    &lt;img src="{{ image.url }}"&gt;
{% endfor %}


to this

{% for image in block.sectionBlockImages %}
    &lt;img src="{{ image.url }}"&gt;
{% endfor %}


...and you should be good.