The issue is no longer reproducible on latest Nightly 67.0a1 (2019-07-21). Tests were performed under Windows 10 (x64), Ubuntu 18.04 (x64) and macOS 10.14
Bug 1557256 Comment 24 Edit History
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The issue is no longer reproducible on latest Nightly 70.0a1 (2019-07-21). Tests were performed under Windows 10 (x64), Ubuntu 18.04 (x64) and macOS 10.14