Both Classic and Lightweight template editors have a live preview, which shows the template's appearance as you develop or edit it. Templates usually contain CTA buttons, which can be of two different kinds:
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a button that redirects to a different URL, e.g., a Subscribe button on an article lock which leads to a Subscription Landing Page.
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a button which triggers login or registration or similar.
When such a button is clicked in the Live Preview, the expected behavior is the following.
The redirecting button opens the page based on the link it leads to.
The triggering button should not perform any action such as login or registration, because the VX modules are not loaded in the Template Editor. If it is correctly configured, the template does what it is supposed to when set live on the page, but not in the Template Editor.
The same applies to both Classic and Lightweight templates.