{{ entry.matrixField.type('copy').nth(0).plainText }}

{% if craft.request.isLivePreview %}
    {% set firstCopyBlock = null %}
    {% for block in entry.matrixField %}
        {% if firstCopyBlock == null and block.type.handle == 'copy' %}
            {% set firstCopyBlock = block %}
        {% endif %}
    {% endfor %}
{% else %}
    {% set firstCopyBlock = entry.matrixField.type('copy').first() %}
{% endif %}

{% if firstCopyBlock %}
    {{ firstCopyBlock.plainText }}
{% endif %}

{% if craft.app.request.isLivePreview %}
    {% set firstCopyBlock = null %}
    {% for block in entry.matrixField.all() %}
        {% if firstCopyBlock == null and block.type.handle == 'copy' %}
            {% set firstCopyBlock = block %}
        {% endif %}
    {% endfor %}
{% else %}
    {% set firstCopyBlock = entry.matrixField.type('copy').one() %}
{% endif %}

{% if firstCopyBlock %}
    {{ firstCopyBlock.plainText }}
{% endif %}