With the newest binaries from today (Development id: 7671) I no
longer get an italic kern after a f in math with legacy fonts:

\tracingoutput1
\showboxbreadth\maxdimen
\showboxdepth\maxdimen
$f(x)$
\bye


...\hbox(0.0+0.0)x20.0, direction TLT
...\mathon
...\teni f
...\tenrm (
...\teni x
...\tenrm )
...\mathoff


with pdftex or luatex from texlive 2024 

...\teni f
...\kern1.0764 (italic)
...\tenrm (
...\teni x
...\tenrm )

With open type fonts / unicode-math there is no problem.

Ulrike



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