Just out of curiosity I had a check online and it appears that Apple has released the beta testing for the 26.4 platform update. When it comes to Safari 26.4 there is a change log available which gives an insight into what will be coming when 26.4 final is released (link). Generally speaking once the list of fixes etc. are made known in the Safari 26.4 beta then the focus is about making sure there aren’t any regressions rather than the possibility of new changes occurring. My guess is that with each release they triage the features are bugs that need to be addressed so that by the time the beta release is made available that the list is more or less finalised.
Regarding macOS 26.4 beta, tvOS 26.4 beta and iOS 26.4 beta, the change logs can be found here for macOS (link), here for iOS (link) and tvOS (link). Looking forward to seeing the improvements because at least in the macOS update there are notes of interface bugs being fixed – keeping in mind that in a lot of cases not all the bug fixes are listed so expect people to document improvements online when the developer and public beta are installed on more devices.
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