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We show that the good reduction locus of the infinite $p$-level Shimura variety attached to this datum, considered as a diamond, can be described as the fiber product of a certain v-stack (which we call ``Igusa stack\") with a Schubert cell of the corresponding $B_{dR}^+$-affine Grassmannian, over the stack of $G_{\\mathbf{Q}_p}$-torsors on the Fargues-Fontaine curve. 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