Here is my experience in the new grid:
- in a text column, when you start to type, the letters are added to the current text (instead of replacing it) but no letter is lost.
- in a number column, the first key is lost and the following ones are appended to the current value (instead of replacing it)
- in other columns types (date, select, relation), the first key is lost, and the following ones are used to search in the picker.
See the video where I type “123” in every case (with up-to-date MS edge on windows, with not extension or other strange utility)