[exim] ${run leaves $value empty

Under Exim 4.96-19 in Debian unstable/testing, ${run fails to put
standard output into $value. E.g., in a .forward file,

  if "${run{/bin/echo -n foo}{}}$runrc" is not 99
    then save /tmp/exim-$runrc-$value  endif

creates file /tmp/exim-0- rather than /tmp/exim-0-foo. It works
correctly in 4.96-15+deb12u1 (Debian 12 stable).

Anyone else seeing this? I don't see any bug reports on it.

Thanks.. Bill

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