openssl: CMP connect timeout with 3.2.0 or fails on `localhost`

I’m getting:

# cmp_main:../apps/cmp.c:3077:CMP info: using section(s) 'Mock connection' of OpenSSL configuration file '../Mock/test.cnf'
# opt_str:../apps/cmp.c:2438:CMP warning: -proxy option argument is empty string, resetting option
# setup_client_ctx:../apps/cmp.c:2088:CMP info: will contact http://localhost:36257/pkix/
# CMP info: sending IR
# CMP error: connect timeout
# CMP error: transfer error:request sent: IR, expected response: IP
../../../../build_static/util/wrap.pl ../../../../build_static/apps/openssl cmp -config ../Mock/test.cnf -section 'Mock connection' -certout ../../../../build_static/test-runs/test_cmp_http/test.cert.pem -proxy '' -no_proxy 127.0.0.1 -server 'localhost:36257' => 1
    not ok 2 - server domain name

    #   Failed test 'server domain name'
    #   at ../test/recipes/80-test_cmp_http.t line 151.
    #          got: '0'
    #     expected: '1'

Full log at: https://buildd.debian.org/status/fetch.php?pkg=openssl&arch=arm64&ver=3.2.0-1&stamp=1701011796&raw=0

I’ve scheduled an other build (on arm64) to see if this is a reproducible.