diff --git a/cylc/flow/id_match.py b/cylc/flow/id_match.py
index 846c2ea3ebf..1e148ea18a4 100644
--- a/cylc/flow/id_match.py
+++ b/cylc/flow/id_match.py
@@ -76,7 +76,7 @@
 
 
 def filter_ids(
-    pool: 'List[Pool]',
+    pool: 'Pool',
     ids: 'Iterable[str]',
     *,
     warn: 'bool' = True,
diff --git a/cylc/flow/scripts/reset.py b/cylc/flow/scripts/reset.py
index 91feb8853c8..a81bfbc9afd 100755
--- a/cylc/flow/scripts/reset.py
+++ b/cylc/flow/scripts/reset.py
@@ -39,6 +39,7 @@
 from functools import partial
 from optparse import Values
 from json import dumps
+from typing import Dict
 
 from cylc.flow.exceptions import InputError
 from cylc.flow.network.client_factory import get_client
@@ -56,6 +57,7 @@
 from cylc.flow.scripts.show import prereqs_and_outputs_query
 
 
+
 MUTATION = '''
 mutation (
   $wFlows: [WorkflowID]!,
@@ -165,11 +167,11 @@ async def run(options: 'Values', workflow_id: str, *tokens_list) -> None:
     # Print `cylc show` info as feedback to user.
     # TODO: do this FIRST; the mutation may not (won't?) be done in time.
     opts = Values()
-    json_filter = {}
+    json_filter: Dict = {}
     opts.json = False
     opts.list_prereqs = False
 
-    ret = await prereqs_and_outputs_query(
+    result = await prereqs_and_outputs_query(
         workflow_id,
         tokens_list,
         pclient,
@@ -179,7 +181,7 @@ async def run(options: 'Values', workflow_id: str, *tokens_list) -> None:
     if opts.json:
         print(dumps(json_filter, indent=4))
     else:
-        print(ret)
+        print(result)
 
 
 @cli_function(get_option_parser)
diff --git a/cylc/flow/task_events_mgr.py b/cylc/flow/task_events_mgr.py
index 72aaffa31c1..46d46aae942 100644
--- a/cylc/flow/task_events_mgr.py
+++ b/cylc/flow/task_events_mgr.py
@@ -1651,9 +1651,6 @@ def reset_bad_hosts(self):
 
     def spawn_children(self, itask, output):
         # update DB task outputs
-        print(f">>>>>>>>>>>>>>>>>>>>>>. {itask}, {output}")
         self.workflow_db_mgr.put_update_task_outputs(itask)
-        self.workflow_db_mgr.process_queued_ops()
-
         # spawn child-tasks
         self.spawn_func(itask, output)
diff --git a/cylc/flow/task_pool.py b/cylc/flow/task_pool.py
index 8fd94f1654d..d4dd94959cf 100644
--- a/cylc/flow/task_pool.py
+++ b/cylc/flow/task_pool.py
@@ -1485,7 +1485,7 @@ def spawn_task(
                     name, point
                 )
             )
-            return False
+            return None
 
         itask = TaskProxy(
             self.tokens,
diff --git a/tests/unit/test_id_match.py b/tests/unit/test_id_match.py
index f68c1458dd1..3fda5527f24 100644
--- a/tests/unit/test_id_match.py
+++ b/tests/unit/test_id_match.py
@@ -60,7 +60,6 @@ def _task_pool(pool, hier) -> 'Pool':
         }
 
     set_cycling_type(CYCLER_TYPE_INTEGER)
-    print(_task_pool, '<<<<<<<')
     return _task_pool