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EDIT3: Reply from Microsoft Support: "Upon checking internally with notebook team, we identified the issue and applied the fix. You can expect the fix to be deployed around mid of October. Meanwhile, we recommend you switch the cell language to another one then switch back to Spark SQL as a mitigation."
In my existing and new Notebooks, which I've set default Language to Spark SQL, all cells are plaintext.
I can change default language to other languages (PySpark) and cell language will update--but if I selected Spark SQL they all become plaintext
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