The recovery token used for sharded transactions is tracked in mongoc_cluster_run_command_monitored, but this function isn't called when executing a bulk write. Recovery token tracking also needs to happen in _mongoc_write_command_execute.

Note: I haven't checked whether other places need to track a recovery token, I merely found this instance because the PHP driver uses bulk writes even for single inserts, which caused our spec tests to fail due to the missing token.