After upgrading our project too from Next 12/React 17 to Next 13/React 18 I am seeing FOUC (Flash of Unstyled Content) that was not present before the upgrade. Nothing within our Emotion setup has changed within the process. We use @emotion/react and @emotion/styled and are on version ^11.x.x. Has something changed with how SSR works within Emotion and React 18 that now causes the FOUC?
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mikematos84
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