viewportSafeAreaInsetBottom not calculated properly

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I have an issue with viewportSafeAreaInsetBottom, I'm using it to set padding for bottom tabbar.
When I open a page with an input, focus an element and then use backbutton to get to the initial page for some reason viewportSafeAreaInsetBottom becomes 0 (on iphone), so the tabbar is not padded properly until I trigger some other ui animation to rerender this page

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I have a workaround that works for me, but maybe this still has to be fixed somehow
To fix it I just use css vars instead of functions

paddingBottom: 'calc(var(--tg-viewport-content-safe-area-inset-bottom) + var(--tg-viewport-safe-area-inset-bottom))',