Telegram-iOS Mini-App Mobile keyboard does not restore page properly when input loses focus on iPhone

Checklist

[x] I am reporting an issue in existing functionality that does not work as intended
[x] I've searched for existing GitHub issues

Description

Telegram iOS mini-app - when virtual keyboard is dismissed due to input field losing focus, lower half of the screen remains blank as if the keyboard is still there.

Expected Behavior

Page should move down the screen reclaiming space freed by the virtual keyboard

Actual Behavior

Page does not move once keyboard goes away

Steps to Reproduce

Open following page from mini-app: https://glider-of-chaos.github.io/bug-telegram-bot-input/
Click on the input field in the lower part of the page (virtual keyboard appears)
Click on any other part of the page to dismiss virtual keyboard.