On P4A, up-to-date GrapheneOS, a screen rotation (auto or manual) disables any gesture response on the bottom navigation bar. The bar is correctly drawn, but does not respond anymore.
So as soon as the screen is rotated, the bottom bar is broken, even if the screen returns in normal portrait.
The ugly workaround is to switch to 3-buttons navigation, then back to gestures.
Does it happen on other devices ?
Thank for your work,