diff --git a/comfy_api/latest/_io.py b/comfy_api/latest/_io.py
index 257f07c42..f6a617c7d 100644
--- a/comfy_api/latest/_io.py
+++ b/comfy_api/latest/_io.py
@@ -387,10 +387,6 @@ class Combo(ComfyTypeIO):
             super().__init__(id, display_name, tooltip, is_output_list)
             self.options = options if options is not None else []
 
-        @property
-        def io_type(self):
-            return self.options
-
 @comfytype(io_type="COMBO")
 class MultiCombo(ComfyTypeI):
     '''Multiselect Combo input (dropdown for selecting potentially more than one value).'''
diff --git a/comfy_execution/graph.py b/comfy_execution/graph.py
index 0d811e354..d262201d9 100644
--- a/comfy_execution/graph.py
+++ b/comfy_execution/graph.py
@@ -6,6 +6,7 @@ import asyncio
 import inspect
 from comfy_execution.graph_utils import is_link, ExecutionBlocker
 from comfy.comfy_types.node_typing import ComfyNodeABC, InputTypeDict, InputTypeOptions
+from comfy_api.latest import IO
 
 # NOTE: ExecutionBlocker code got moved to graph_utils.py to prevent torch being imported too soon during unit tests
 ExecutionBlocker = ExecutionBlocker
@@ -97,6 +98,10 @@ def get_input_info(
         extra_info = input_info[1]
     else:
         extra_info = {}
+    # if input_type is a list, it is a Combo defined in outdated format; convert it
+    if isinstance(input_type, list):
+        extra_info["options"] = input_type
+        input_type = IO.Combo.io_type
     return input_type, input_category, extra_info
 
 class TopologicalSort:
diff --git a/comfy_execution/validation.py b/comfy_execution/validation.py
index 24c0b4ed7..a5e9675da 100644
--- a/comfy_execution/validation.py
+++ b/comfy_execution/validation.py
@@ -29,6 +29,11 @@ def validate_node_input(
     if received_type == IO.MatchType.io_type or input_type == IO.MatchType.io_type:
         return True
 
+    # This accounts for some custom nodes that output lists of options as the type;
+    # if we ever want to break them on purpose, this can be removed
+    if isinstance(received_type, list) and input_type == IO.Combo.io_type:
+        return True
+
     # Not equal, and not strings
     if not isinstance(received_type, str) or not isinstance(input_type, str):
         return False
diff --git a/comfy_extras/nodes_logic.py b/comfy_extras/nodes_logic.py
index 95a6ba788..8dde4eb1e 100644
--- a/comfy_extras/nodes_logic.py
+++ b/comfy_extras/nodes_logic.py
@@ -141,6 +141,28 @@ class AutogrowPrefixTestNode(io.ComfyNode):
         combined = ",".join([str(x) for x in vals])
         return io.NodeOutput(combined)
 
+class ComboOutputTestNode(io.ComfyNode):
+    @classmethod
+    def define_schema(cls):
+        return io.Schema(
+            node_id="ComboOptionTestNode",
+            display_name="ComboOptionTest",
+            category="logic",
+            inputs=[io.Combo.Input("combo", options=["option1", "option2", "option3"]),
+                    io.Combo.Input("combo2", options=["option4", "option5", "option6"])],
+            outputs=[io.Combo.Output(), io.Combo.Output()],
+        )
+
+    @classmethod
+    def validate_inputs(cls, combo: io.Combo.Type) -> bool:
+        if combo not in ["option1", "option2", "option3"]:
+            return "Invalid combo: {}".format(combo)
+        return True
+
+    @classmethod
+    def execute(cls, combo: io.Combo.Type, combo2: io.Combo.Type) -> io.NodeOutput:
+        return io.NodeOutput(combo, combo2)
+
 class LogicExtension(ComfyExtension):
     @override
     async def get_node_list(self) -> list[type[io.ComfyNode]]:
@@ -149,6 +171,7 @@ class LogicExtension(ComfyExtension):
             # DCTestNode,
             # AutogrowNamesTestNode,
             # AutogrowPrefixTestNode,
+            ComboOutputTestNode,
         ]
 
 async def comfy_entrypoint() -> LogicExtension: