The CSS selector in manual-tests/bidi-parens.html is wrong so the font-family rule isn't applied to the Hebrew text. The test is also misleading because it doesn't mention that it requires a third-party font that typical OS X installations don't have.
Created attachment 460353 [details]
Safari 15.5 matches other browsers
Based on commit from Webkit Github mirror - https://github.com/WebKit/WebKit/commit/ea30f082a7a9aa52c9e4fe39543813f57c0f6113
This is added in 2015 and I can see, it is present in SVN trunk as well:
Search for "bidi".
In the attached screenshot, you can see latest output across all browsers and how they reflect. I am not sure based on Comment 01, whether it is something different expected here but I do see difference in font rendering across all.
The test looks functional now. Perhaps we should convert this to a ref test & make it automatic.
Probably not much value in doing that.
OK, let's just close this as config changed then.