When running parsoid's PHPUnit tests, the message above is printed during execution but doesn't cause any tests to fail. This can be observed in CI runs that include parsoid tests, e.g. https://integration.wikimedia.org/ci/job/wmf-quibble-core-vendor-mysql-php74-docker/38888/consoleFull:
........................................................... 7788 / 25619 ( 30%) ........................[info/dsr/inconsistent] DSR inconsistency: cs/s mismatch for node: pre s:0 ; cs:49 ................................... 7847 / 25619 ( 30%) ........................................................... 7906 / 25619 ( 30%)