A typical query from a visual adds IGNORE around default format string measures. If a measure is from a composite model, the composite model will translate the query and send it to the underlaying model. The translated query will NOT have the IGNORE instruction. That leads to a cartesian product of all attributes sent from the underlying model to the composite one.
It is super slow and inefficient. There is a workaround: create a measure referencing the underlying measure but that eliminates the whole idea of the Composite models. It does look like a bug.
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