While I agree with the previous posters about what should happen, especially when the problem is assigned to lack of resources, anecdotal evidence from this very forum shows that some less than competent external auditors would give this a pass; especially the ones that work for unaccredited and pseudo-accredited CB's.
In depth assessment of the internal audit process effectiveness is something that many CB auditors fail to perform.
Sadly, the norm for most organizations that "comply" with ISO 9001 and other ISO 9001-based standards is to have an internal audit process that adds little business value, from the leadership's perspective. If the top management of an organization felt they derived business benefits from internal audits, they would ensure resources were provided and demand it's effective deployment. As it is, for most organizations, internal audits are a meaningless exercise.