The answer
One tester may complete, edit, or delete data another tester expects to remain unchanged. Separate fixtures make failures reproducible and easier to attribute.
Why should code review and QA run while the developer performs manual testing?
Why should parallel testers avoid sharing mutable task fixtures?
More FAQs in Why should code review and QA run while the developer performs manual testing?
It is useful after a coherent implementation checkpoint exists and participants have clear assignments. Unstable inputs can create more coordination work than the parallelism saves.
Record the new version and tell reviewers which behavior changed. Recheck affected findings against that version rather than assuming earlier results still apply.
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