If this was a problem with iOS or Safari, wouldn’t we expect this to happen in other areas where the kaypad is opened, as well as other websites? This is not occuring for the user.
I was unable to replicate it on my Google Pixel 6 Android exactly, however I can observe something similar.
when opening the screen containing the chat component and the chat is empty (i’m making the first comment), after tapping in the ‘write something…’ entry section the keypad opens and simultaneously the whole screen moves upwards to above the keypad so the bottom of the tab icons are above the keypad, and the top portion of the component, as well as the page header and navigation button are out of view.
This looks like what is opening on the iPhone but to a more severe degree as the entry field has reached the top of the screen on the iPhone.
Furthermore, on my Google Pixel, this doesn’t happen every time, I can’t find a pattern to it’s behaviour but if I close the keypad and re-open it sometimes the screen does not move upwards and the tab icons remain behind the keypad.