Page navigation not working w/ flipLeft & flipRight transitions (Android) #8100

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.2
• Cross-platform modules: 6.2
• Android Runtime: 6.2
• iOS Runtime:
• Plugin(s):

Describe the bug
The following page navigation is not working.

It works once...you can see I'm toggling the flip - but second and subsequently - not working.

If I comment out the transition - then the navigation takes place.

       let page_def =
        {
            moduleName: "test-page",
            animated: true,
            clearHistory: true,
            transition:
            {
                name: bSwitch2List ? "flipRight" : "flipLeft",
                duration: 350,
                curve: "easeOut"
            }
        };

        frameModule.Frame.topmost().navigate( page_def );