diff --git a/changes.d/6798.fix.md b/changes.d/6798.fix.md
new file mode 100644
index 00000000000..febc1600331
--- /dev/null
+++ b/changes.d/6798.fix.md
@@ -0,0 +1 @@
+Prevent unintended submission retries that could result from platform connection issues in certain circumstances.
diff --git a/conda-environment.yml b/conda-environment.yml
index fed33d57a88..e76af3f00cf 100644
--- a/conda-environment.yml
+++ b/conda-environment.yml
@@ -17,7 +17,7 @@ dependencies:
   - python
   - pyzmq >=22
   - importlib_metadata >=5.0 # [py<3.12]
-  - urwid >=2,<3,!=2.6.2,!=2.6.3
+  - urwid >=2.2,<3,!=2.6.2,!=2.6.3
   - tomli >=2 # [py<3.11]
 
 # optional dependencies
diff --git a/cylc/flow/scheduler.py b/cylc/flow/scheduler.py
index 3b4693fe960..83fe494e49e 100644
--- a/cylc/flow/scheduler.py
+++ b/cylc/flow/scheduler.py
@@ -1047,15 +1047,6 @@ async def process_command_queue(self) -> None:
 
             self.command_queue.task_done()
 
-    def info_get_graph_raw(self, cto, ctn, grouping=None):
-        """Return raw graph."""
-        return (
-            self.config.get_graph_raw(cto, ctn, grouping),
-            self.config.workflow_polling_tasks,
-            self.config.leaves,
-            self.config.feet
-        )
-
     def _set_stop(self, stop_mode: Optional[StopMode] = None) -> None:
         """Set shutdown mode."""
         self.proc_pool.set_stopping()
diff --git a/cylc/flow/task_job_mgr.py b/cylc/flow/task_job_mgr.py
index e0cecad623c..70a8ec6caf0 100644
--- a/cylc/flow/task_job_mgr.py
+++ b/cylc/flow/task_job_mgr.py
@@ -573,10 +573,11 @@ def _get_platform_with_good_host(
         Returns:
             The platform with a good host, or None if no such platform is found
         """
+        out_of_hosts = False
         for itask in itasks:
             # If there are any hosts left for this platform which we
             # have not previously failed to contact with a 255 error.
-            if any(
+            if not out_of_hosts and any(
                 host not in self.task_remote_mgr.bad_hosts
                 for host in itask.platform['hosts']
             ):
@@ -618,6 +619,7 @@ def _get_platform_with_good_host(
                     itask.platform['name'],
                 )
             )
+            out_of_hosts = True
             done_tasks.append(itask)
 
         return None