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The configureFailPoint command in passthrough tests is not compatible with multiple routers, because there is no guarantee that the failpoint will be enabled on the router that actually executes the query. In addition, the failpoint may remain enabled for subsequent tests if the command to disable it is sent to a different mongos than the one on which it was originally enabled.

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xgen-internal-githook commented on Mon, 2 Mar 2026 23:06:26 +0000: Author: {'name': 'Enrico Golfieri', 'email': 'enrico.golfieri@mongodb.com', 'username': 'enricogolfieri'} Message: SERVER-120020 throw on multi-router in case of configureFailPoint (#48452) GitOrigin-RevId: 9faf6d1cf0aa7884b4e9b2c5c620e38d4908ee73 Branch: master https://github.com/mongodb/mongo/commit/683ee01795cfa347e9f385c2a5ea855a48b90229

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