Japanese app names are all grouped under "#" on Galaxy S25

Hello Niagara Launcher team,

I'm using Niagara Launcher v1.16.15 on a Samsung Galaxy S25 running One UI 8.5.

I noticed that all apps with Japanese names are grouped under "#" in the app list.

My device language is Japanese only, and the app language for Niagara Launcher is set to Use system language.

The app index on the right side shows only A, B, C... instead of Japanese sections, and Japanese app names are not sorted by their pronunciation or romanization.

Examples of apps that appear under "#":

Settings

Clock

Calculator

Phone

Mitsubishi UFJ Bank

Odakyu App

Jorudan (Transfer Guide)

I have already tried:

Updating to the latest version (v1.16.15)

Restarting the phone

Confirming that the system language is Japanese

Is this expected behavior, or could this be a bug?

Thank you for your help.