I just updated from Ubuntu 18 to Ubuntu 20, which also updated my Google Chrome. I use Xmodmap to modify some of my keys. The modified keys for navigation — such as Left and Up — no longer work in Google Chrome. They still work everywhere else.
In many situations, the cursor is indeed moving accordingly, but Google Chrome doesn’t show the new placement of the cursor, so the cursor doesn’t indicate where the text is being inputted. The problem is worse in Jupyter Notebook that are displayed with Google Chrome.