At the top of Thunderbird, I have a search bar. I can also get to it with CTRL-K. I used to be able to search for a word or text within messages from there. However, when I try to search for something, it finds messages that are from 2018 and older. It doesn't find messages from 2022 or 2023 even though this word or phrase exists in the message. Why won't it find matches for anything newer than 2018? Thanks.