Add an extra try when resolving attributes lookup (#5780)

holoviews/plotting/bokeh/callbacks.py

@@ -15,7 +15,7 @@
 
 from ...core.options import CallbackError
 from ...core.util import (
-    datetime_types, dimension_sanitizer, dt64_to_dt
+    datetime_types, dimension_sanitizer, dt64_to_dt, isequal
 )
 from ...element import Table
 from ...streams import (
@@ -234,7 +234,7 @@ def resolve_attr_spec(cls, spec, cb_obj, model=None):
         be the same as the model.
         """
         if not cb_obj:
-            raise Exception(f'Bokeh plot attribute {spec} could not be found')
+            raise AttributeError(f'Bokeh plot attribute {spec} could not be found')
         if model is None:
             model = cb_obj
         spec = spec.split('.')
@@ -337,15 +337,18 @@ async def process_on_change(self):
             else:
                 obj_handle = attr_path[0]
             cb_obj = self.plot_handles.get(obj_handle)
-            msg[attr] = self.resolve_attr_spec(path, cb_obj)
+            try:
+                msg[attr] = self.resolve_attr_spec(path, cb_obj)
+            except Exception:
+                # To give BokehJS a chance to update the model
+                # https://github.com/holoviz/holoviews/issues/5746
+                await asyncio.sleep(0.05)
+                msg[attr] = self.resolve_attr_spec(path, cb_obj)
 
         if self.skip_change(msg):
             equal = True
         else:
-            try:
-                equal = msg == self._prev_msg
-            except Exception:
-                equal = False
+            equal = isequal(msg, self._prev_msg)
 
         if not equal or any(s.transient for s in self.streams):
             self.on_msg(msg)