When using a date-based property in SDC, the HTML element is appearing in the text of the pop-up, as can be seen in this screenshot.
In Wikidata, this is styled in larger, bolded text, like this:
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Event Timeline
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMar 1 2022, 6:23 PM2022-03-01 18:23:54 (UTC+0)
Dominicbm closed this task as a duplicate of T300830: [M] When adding a date literal HTML with a span is shown.Mar 2 2022, 9:07 PM2022-03-02 21:07:45 (UTC+0)