Using button--icon--* CSS classes doesn't shown icons

[Kirby]

The following codes show a button with an icon in XF 2.2 but not in XF 2.3

HTML:

<xf:button href="https://..." class="button--link button--icon button--icon--hide">Test</xf:button>

HTML:

<a class="button--link button--icon button--icon--hide button">
    <span class="button-text">
        Test
    </span>
</a>

The following code shows the icon in both versions, but switching the icon on click does not work in XF 2.3 although the CSS class is switched just like in XF 2.2
HTML:

...

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Using button--icon--* CSS classes doesn't shown icons

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