Loading icon on IndicatingAjaxButton and IndicatingAjaxLink not showing - wicket

I am having issues with the loading icon on the IndicatingAjaxButton and
IndicatingAjaxLink. Previously I was on Wicket 9.0.0-M4 and the icons were working
fine. But after upgrading to Wicket 9.0.0-M5 (or later versions), I'm not
able to see the loading icon any longer.
I checked and found that the AjaxIndicatorAppender now has the
hidden attribute instead of the style=display:none. However, when I click
the IndicatingAjaxButton, it will still append the style=display:inline as
before (with the hidden attribute still present).
I've not done any changes to the dependency, only upgrade the Wicket versions. Is there anything that I would need for the upgrade for the button to work?
Please advise. Thank you.

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http://ionicframework.com/docs/api/page/tap/
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