Unexpected match in test_ksr_twotone test (again)

Job #4890987 failed for 887b0457.

The test_ksr_twotone test failed because of an unexpected match:

_______________________________ test_ksr_twotone _______________________________
[gw1] linux -- Python 3.12.7 /usr/bin/python3
/builds/isc-projects/bind9/bin/tests/system/ksr/tests_ksr.py:1050: in test_ksr_twotone
    isctest.kasp.check_apex(ns1, zone, ksks, zsks)
/builds/isc-projects/bind9/bin/tests/system/isctest/kasp.py:529: in check_apex
    check_signatures(rrsigs, dns.rdatatype.DNSKEY, fqdn, ksks, zsks)
/builds/isc-projects/bind9/bin/tests/system/isctest/kasp.py:398: in check_signatures
    numsigs += _check_signatures(signatures, covers, fqdn, zsks)
/builds/isc-projects/bind9/bin/tests/system/isctest/kasp.py:351: in _check_signatures
    assert f" {key.tag} {fqdn}" not in rrsig
E   AssertionError: assert ' 15391 two-tone.test.' not in 'two-tone.test. 3600 IN RRSIG DNSKEY 13 2 3600 20241114011125 20241031001125 15391 two-tone.test. EObCYckmC5XomF3A/W3pN9O7swfvwWJO V0rdrxvcmWZqc6PZZVHtA7w3O7bCb6NA GV7C01jQBSMFsm/y4KZ+nw=='
E     
E     ' 15391 two-tone.test.' is contained here:
E       two-tone.test. 3600 IN RRSIG DNSKEY 13 2 3600 20241114011125 20241031001125 15391 two-tone.test. EObCYckmC5XomF3A/W3pN9O7swfvwWJO V0rdrxvcmWZqc6PZZVHtA7w3O7bCb6NA GV7C01jQBSMFsm/y4KZ+nw==
E     ?                                                                            +++++++++++++++++++++
---------------------------- Captured log teardown -----------------------------

It's similar to #5002 (closed) but not a simple case of a mismatch.