Using the latest release (ConTeXt ver: 2024.06.16 18:22 LMTX fmt: 2024.6.17, the following renders correctly with pagella but not cambria.
\setupbodyfont[cambria, 12pt] \starttext \startformula s\of(1) = s\of (\set{0}) = \set{0} \cup \set{\set{0}} \stopformula \stoptext __martin
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