Confirming this. Filtering Console for mediaanalysisd shows the workload is a chain of MADTextEmbeddingTask runs scheduled for client com.apple.spotlightknowledged.updater. In my case (an iOS podcast app) the trigger is CSSearchableIndex.indexSearchableItems(...): each batch produces a sustained CPU storm in the Simulator. I verified the cause by gating the Core Spotlight calls under #if targetEnvironment(simulator). With those calls skipped, mediaanalysisd stays idle and the fans stop. If you can reproduce, please file Feedback referencing this thread so Apple can prioritize.

Same issue here