js_on_click does not work for param.Action buttons

[sdc50]

ALL software version info

In [3]: param.__version__                                                                                                                                                                                                                                                                                                                                               
Out[3]: '1.10.0a2'

In [4]: pn.__version__                                                                                                                                                                                                                                                                                                                                                  
Out[4]: '0.10.0a2'

Description of expected behavior and the observed behavior

Adding JavaScript code to a Button widget created from a param.Action through js_on_click doesn't have any effect.

Complete, minimal, self-contained example code that reproduces the issue

class JsButton(param.Parameterized):
    param_btn = param.Action(lambda self: print('Action Python Response'), label='Action')
    
    def panel(self):
        button_wg = pn.widgets.Button(name='Widget')
        button_wg.on_click(lambda e: print('Widget Python Response'))
        button_wg.js_on_click(code='console.log("Widget JS Response")')
        
        param_btn = pn.Param(self.param.param_btn)
        param_btn[0].js_on_click(code='console.log("Action JS Response")')
        
        return pn.Column(
            param_btn,
            button_wg,
        )
    
test = JsButton()
test.panel()

Stack traceback and/or browser JavaScript console output

Python callback returned following output:
	Action Python Response
Widget JS Response
Python callback returned following output:
	Widget Python Response

[xavArtley]

As a work around you can do this

class JsButton(param.Parameterized):
    param_btn = param.Action(lambda self: print('Action Python Response'), label='Action')
    
    def panel(self):
        button_wg = pn.widgets.Button(name='Widget')
        button_wg.on_click(lambda e: print('Widget Python Response'))
        button_wg.js_on_click(code='console.log("Widget JS Response")')
        
        param_btn = pn.Param(self.param.param_btn)[0]
        param_btn.js_on_click(code='console.log("Action JS Response")')
        
        return pn.Column(
            param_btn,
            button_wg,
        )
    
test = JsButton()
test.panel()