The following tests were disabled from running in the sharding_last_stable_mongos_and_mixed_shards because they run sharded lookup queries and will not work when mongos is running on a version that doesn't support speculative majority find queries:

jstests/sharding/change_stream_lookup_single_shard_cluster.js
jstests/sharding/change_stream_read_preference.js
jstests/sharding/change_stream_update_lookup_collation.js
jstests/sharding/change_streams_primary_shard_unaware.js

When all the backports for SERVER-37560 are complete, we can re-enable these tests.