slight changes to arg names will get this working again

app.py

@@ -93,10 +93,10 @@ with gr.Blocks() as blocks:
     btn.click(fn=None,
                      inputs=[],
                      outputs=[hidden_state],
-                     _js=get_js)
+                     js=get_js)
     # run python function on change of hidden textbox, add your logic to run function
     hidden_state.change(fn=run, inputs=[hidden_state], outputs=[out])
     # load JS on load of the page
-    blocks.load(None, None, None, _js=load_js)
+    blocks.load(None, None, None, js=load_js)
 
 blocks.launch()