SERVER-100260 (8.2) added new functionality to Queryable Encryption $lookup that breaks the existing aggregate_lookupMultiSchema.js test when run in a 8.1+8.2 multiversion cluster. That test is tagged with requires_fcv_81, and needs to be updated to requires_fcv_82. Similarly, findandmodify_wce.js was added in 8.2, but has a requires_fcv_81 tag, so it is now updated to requires_fcv_82.
Lastly, fts_spilling.js is not suited to run in a multi sharded cluster fixture as sharded_collections_query_shape_hash_stability_multiversion does, so it is excluded from the suite.