Hello Andrew,
I just checked this and the quick task is available when there are no items in the Grid (you can see this in the first attached screenshot). In any case, if it does not appear for some reason for you, a simple workaround is to copy an existing items count verification and change the value of the ItemCount property to whatever value you need to verify against. I am attaching a screenshot to illustrate this as well.
Best wishes,
Pavel
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