FOUC – I have flash of unstyled content issue

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Probably some of your CSS files contains an invalid line (eg unclosed media query), which can break the Critical CSS generation.
In most cases it is caused by custom styling, but plugin and theme styles can also cause the issue. Try to exclude files one-by-one from merging: Settings > Optimization > Styles > Exclude Styles, to find what is causing the issue.
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