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    $\begingroup$ This really depends on how the derivative of S participates in subsequent calculation. Can you show a few examples? $\endgroup$ Commented Jul 24, 2020 at 1:29
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    $\begingroup$ Interesting, I didn't notice this behavior before. It's because stuff inside Format is automatically evaluated (yeah, though := owns the attribute HoldAll). Luckily it's easy to resolve, just add a HoldPattern, see my update. $\endgroup$ Commented Jul 24, 2020 at 12:36
  • $\begingroup$ @xzczd No words☺️☺️Amazing $\endgroup$ Commented Jul 24, 2020 at 12:42