Every fix has two addresses
You can correct this asset, or correct the thing that produced it. They take about the same time and only one of them scales.
Turn what the sample found into upstream changes, so a single fix applies to the whole batch instead of one asset.
When the sample turns up something wrong, there is a fork that decides whether the next hour is spent well. You can fix the asset in front of you, which takes two minutes and resolves one page. Or you can fix what produced it, which takes about the same time and resolves every page carrying the same defect, including the ones you did not sample.
Choosing correctly needs a moment of diagnosis rather than a reflex. The question is not whether this is wrong; it is why generation produced it, and the answer routes the fix to a different place depending on which input was responsible.

The genuinely hard judgment is that a pattern often shows up exactly once in a sample of twelve. Seeing something once is not evidence that it is isolated. It is evidence that it occurs at least once in twelve, which across a hundred-asset batch is a meaningful rate and probably eight more instances you have not looked at.
The cheap resolution is to check rather than infer. When something might be systematic, pull two or three more assets that would exhibit the same defect if it were, and look. That is a few minutes of work, and it converts a guess into a finding, which is the difference between fixing the campaign and fixing a page.
Changing an artifact or a style attribute changes how everything generates, which is exactly why it is worth doing and exactly why it needs verifying. Regenerate the affected assets and draw a fresh sample, including at least one asset that was fine before, to confirm the fix did not introduce a new problem somewhere else.
That loop is the whole skill of working at volume: sample, diagnose, fix upstream, regenerate, re-sample. Teams who learn it review large campaigns in a morning. Teams who do not spend a week hand-editing assets and ship a campaign whose actual defects were never addressed, because every fix was applied one page at a time to a problem that existed in a hundred.
Do this in the product
You should be able to answer each of these from memory before opening it. Recalling the answer is what makes it stick; recognizing it when you read it does not.
The sequence style attributes, not the assets. Style governs every future generation, so one change fixes the batch and everything after it.
Because it is evidence of a rate, not of an exception. Across a hundred assets that is roughly eight more instances you have not looked at. Pull two or three more assets that would show the same defect and check.
At least one asset that was already fine, to confirm the change fixed the defect without introducing a new problem elsewhere.
You can correct this asset, or correct the thing that produced it. They take about the same time and only one of them scales.
Seeing something once in a sample of twelve is evidence it happens at least once in twelve. For a hundred assets that is meaningful.
Regenerate and re-sample, including one asset that was already fine, to confirm the fix worked and broke nothing.
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