Steps to reproduce:

1. Open speaker block gui and type a message into the text field.
2. Close speaker block gui using "Done" button or pressing Esc.
3. Attempt to trigger speaker block with redstone --> Blank message printed
4. Re-open speaker block gui --> Message has not been stored

Mod version: supplementaries-1.20-2.5.18
Forge Version: 47.1.0
Minecraft Version: 1.20.1

No other mods present except for Moonlight lib and JEI.