If the resource part ist wide enough so only a part fo the events area is shown and I reduce the resource part, then the hidden events resp. cell are not rendered. After moving the scrollbar they get rendered correctly. See please the attached screenshot.
You can reproduce the bug with this project (https://drive.google.com/file/d/1RWm6ZfSsTc93GwefvEImwf2uSRS7-XcD/view?usp=sharing)