The primitive that appears in the backtraces from the older instance,
but not the newer is
re_match_2_internal
which is in emacs/src/regex.c.
That is the inner function that does regexp matching. Could you
please show a backtrace of the inner 5 or 10 C stack frames that call
it? Then we will see which C primitive was called.
Also, by looking at the args to that C primitive, you can see
what the regexp is.
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