db.createCollection( "ts_empty_meta" , { timeseries: { timeField: "t" , metaField: "" } }) // Expected: InvalidOptions error // Actual: { ok: 1 } // Subsequent query on the collection can produce incorrect results: db.ts_empty_meta.insertMany([ { t: new Date(), "": " x", a: 0 }, { t: new Date(), "": " y", a: 1 } ]) db.ts_empty_meta.aggregate([{ $match: { a: 0 } }]).toArray() // May return [] instead of [{ a: 0, ... }]   Encountered in: https://parsley.corp.mongodb.com/test/mongodb_mongo_master_enterprise_amazon_linux2023_arm64_all_feature_flags_bulk_write_sharded_collections_jscore_passthrough_3_linux_enterprise_patch_abb12bfd0e5ed75ab4d8c749f491deb3684b84c9_69e884460134ec000746f900_26_04_22_08_20_33/0/8a15ad76ff1d4f1406a4d234e33ca387?bookmarks=0,147963&shareLine=0 While running with https://github.com/10gen/mongo/pull/52033