Division by zero: undefined behaviour in circuitpadding/circuitpadding_sample_distribution test

When running the tor unit tests on macOS with --enable-expensive-hardening, I get the following error:

circuitpadding/circuitpadding_sample_distribution: [forking] ../src/lib/math/prob_distr.c:1311:17: runtime error: division by zero
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/lib/math/prob_distr.c:1311:17 in 
../src/lib/math/prob_distr.c:1219:49: runtime error: division by zero
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ../src/lib/math/prob_distr.c:1219:49 in 
OK

My full configure command-line is:

configure --disable-asciidoc --with-libevent-dir=/usr/local --with-openssl-dir=/usr/local/opt/openssl --enable-lzma --enable-zstd --enable-libscrypt CC=clang --enable-gcc-warnings --enable-expensive-hardening PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig

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