Categorical univalence of a universe does not entail function extensionality, as shown by polynomial models of type theory that refute the latter while satisfying the former.
https://www.math.ias.edu/vladimir/sites/math.ias.edu.vladimir/files/univalent_foundations_project.pdf
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Univalence without function extensionality
Categorical univalence of a universe does not entail function extensionality, as shown by polynomial models of type theory that refute the latter while satisfying the former.