Custom 'Action' menu item only showing on browser cache refresh

This is code from the Develop your first application tutorial in the developer documentation.

An 'Action' menu item is set up in the client module of the section edit page:

/* Add the action to the action menu. */
getActions: function() {
    var actionMenuItems = this.callParent(arguments);
    actionMenuItems.addItem(this.getButtonMenuItem({
	    "Caption": {bindTo: "Resources.Strings.AddTrainingsActionCaption"},
	    /* Define the handler method for the action. */
	    "Click": {bindTo: "getBusinessProcessAddTrainings"},
	    "Enabled": true
    }));
    return actionMenuItems;
},

The menu option however only shows when the browser cache has been refreshed.  It happens every time an edit page is opened for a record (not just the first time an edit page is opened).  There initially is a blank space where the menu item should be, after a refresh the menu item shows.  There are some errors in the console:

When the page is loaded...

all-combined.js:41 The Id column is not declared in the ViewModel of the menu item

When the initial blank menu item is clicked:

Uncaught TypeError: Cannot read properties of undefined (reading 'apply')
    at i.callModelMethod (all-combined.js:41)
    at i.<anonymous> (all-combined.js:41)
    at i.fire (all-combined.js:6)
    at i.continueFireEvent (all-combined.js:6)
    at i.fireEventArgs (all-combined.js:6)
    at i.fireEvent (all-combined.js:6)
    at i.onClick (all-combined.js:41)
    at HTMLLIElement.eval (eval at cacheableFunctionFactory (all-combined.js:6), <anonymous>:6:13)
    at HTMLLIElement.k (all-combined.js:6)
    at t.value (polyfills-es5.js?hash=96751a9859cf44a7a1eb788f80c32556:1)
user: XXXX XXXX /268b5da7-2ede-4b32-8bbe-9af04721ebba
 file: https://110816-crm-bundle.creatio.com/core/83382b3fa36e6adf19d56492fa6ed49d/ng-core/src/polyfills-es5.js?hash=96751a9859cf44a7a1eb788f80c32556
 line: 1
 column: 16702
 message: Uncaught TypeError: Cannot read properties of undefined (reading 'apply') 
 date: Fri Dec 24 2021 14:10:31 GMT+0000 (Greenwich Mean Time)
 stack: TypeError: Cannot read properties of undefined (reading 'apply')
    at i.callModelMethod