Happens to me as well, I assume it's a bug in 4.9. Two things that can be done atm:
- Try typing less letters in search, and manually scrolling, it prompts "open" for first mods only from what I've noticed.
- You can type /set mod exactmodName.tbm, a protip is: you can type in few first letters and press Tab, it will auto-finish the name or if it doesn't, it'll give you names of all mods that start with those letters