The footgun of right-to-left decorative characters

Fleurons, and other printer's ornaments are decorative elements used in typography. Many of these have made it into fonts in the digital age, with Unicode supporting classic fleurons like ❦ and ❧, but also additional symbols-turned-visual indicators ranging from the aptly named ❀ (White Florette) to the lesser known ᪥ (Tai Tham Sign Dokmai). I was recently exploring using 𐫱 as a delineator between the date and post categories, but found that it was unexpectedly rendering in the middle of the tag: