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The Subquery class which Exists inherits from defaulted to using single-valued querie's field if no output_field was explicitly specified on initialization which was bypassing the Exists.output_field defined at the class level. Moving Subquery's dynamic output_field resolution to _resolve_output_field should make sure the fallback logic is only performed if required. Regression in 08654a99bbdd09049d682ae57cc94241534b29f0. Thanks Oli Warner for the detailed report.
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