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The original reason failures happened was because the form name was used to construct the file name of the PDF, which resulted in nested paths with forward slashes.
The ambition with hypothesis was nice - whatever form name you specify should not result in broken file saving, but hypothesis comes up with some very exotic unicode characters that font libraries and/or weasyprint sometimes cannot handle. These edge cases are not worth fixing or mitigating with fancy input validating restricting the unicode range of valid characters, but we also do not want these flaky test failures.
The test is rewritten without hypothesis to illustrate the original failure, preventing similar further regressions. If the edge cases do happen for real, we'll have a stakeholder funding the extra mitigations needed.