Filter behavior with new entries [duplicate]

let's say I have a table with a column 'Name' and the user has set a column filter for 'Frank'. He currently sees some entries which match his search. This table is configured to accept new items via in-Table editing. If the user (with active filter) enters a new entry which does NOT match this filter (e.g. an entry with name 'Helen'), should the new entry...

a) be disappearing instantly after the user entered it because it does not match the filter? OR b) stay visible although it does not match the current filter because the user explicitly entered it and it would be bad UX to pull it away from him?

What do you think? I couldn't find any examples, so I am hoping on some UX advice here.

All the best and have a nice day, Nadine