Chrome Version: 72.0.3626.49 (Official Build) beta (64-bit)

(1) Enable full screen magnification
(2) Zoom in (ctrl+alt+brightness keys)
(3) Open a Pages spreadsheet
(4) Select any cell by clicking on it
(5) Start typing anything

Expected result: Focus will follow input cursor

Actual result: Focus jumps to the top left corner of the screen

Work-around: Continue typing and focus returns to cursor. 

Additional Info: This also happens when double clicking on a cell, selecting suggested input for a cell with clicks or with enter, and sometimes when tabbing between cells.