On earlier iOS versions Live Activity displays correctly according to mode set. Can't find an opened issue for that
version: iOS 26 device: iPhone 16
On iOS26 Live Activity appears in Dark Mode style for Light and dark Mode
Live Activities is not behaving as expected and is different in iOS 26, this is something our engineers should take a look at.
We'd greatly appreciate it if you could open a bug report, sample code or models that reproduce the issue, and post the FB number here once you do.
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I have submitted a bug report of unexpected behaviour of Live Activities in iOS 26. The Feedback number is: FB20187110 I hope engineers could investigate the problem.