http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash is new in [MS-DOCX] v15.0 of 22 March. Word writes this namespace prefix to @mc:Ignorable in the MDP, for example, "w14 w15 w16se w16cid w16 w16cex w16sdtdh wp14", so Word requires the namespace to also be declared.
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