This is not a regression from the recent swipe-to-nav macOS UI refresh. I can reproduce this in current Nightly 2023-01-24, as well as in Nightly from nearly 2 months ago, 2022-12-01, which doesn't have the recent changes. (I haven't done further regression testing.)
Bug 1812211 Comment 1 Edit History
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This is not a regression from the recent swipe-to-nav macOS UI refresh. I can reproduce this in current Nightly 2023-01-24, as well as in Nightly from nearly 2 months ago, 2022-12-01, which doesn't have the recent changes. (I haven't done further regression testing so I'm not sure how far back this goes; but it goes back at least as far as 2022-12-01.)