A family of Microsoft word processing software products for creating web, email, and print documents.
This is simply a design change in the UI... Whether it's intentional or inadvertent I have no idea :-) If you find it to be problematic don't hesitate to use the ☺︎ at the right end of a document title bar to submit your remarks.
NB: I'm afraid Cliff seems to think you're referring to Text Boxes rather than Table Cells.