Please see the following screencase where I walk you through the solution plus some workflows.
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Summary:
The issue was caused by incorrect URLs, which led to 404 errors.
Resolution:
To fix this, I navigated to WPML → Translation Management, re-sent the affected template part (which contains the button URLs) for translation, and simply clicked "Update".
Additional Note:
In WPML → Settings → Translated documents options → Page URL, we have the option set to "Translate". This setting includes the slug in the translation, giving you manual control in the editor. If you'd prefer the slug to be automatically generated from the title (the default behavior), you can switch to "Auto-generate from title".
We initially changed this setting to address earlier issues with template parts. It's unclear if that’s still necessary, but I personally recommend keeping it as is. Having more control over permalinks is generally beneficial, and with automatic translation enabled, the slug should still translate appropriately.
