@EmmaHolland or @Abdus-Samad have you filed bug tracker reports yet? I want to make sure Apple sees this issue and the bug reports are often the only way to get their attention.
Please let me know if you do open a bug report (or if you've already done so). More info here: https://developer.apple.com/bug-reporting/
Topic:
Safari & Web
SubTopic:
General
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