There are some images of the output and discussion of the \showlists trace
in the stackexchange post at

https://tex.stackexchange.com/a/734734/1090

but this plain luatex file

\tracingonline1
\showboxdepth10

\immediate\write500{\meaning\Arrowvert}

$\Arrowvert + \Big\Arrowvert\showlists $

\expandafter\show\the\textfont3


\bye


produces the expected || character with pdftex but a { character with
luatex even though both claim to be using the same extension font (cmex10)

David
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