Some sounds are not heard after packaging.

Some sounds are not heard after packaging.
I am developing a multiplayer game using servers provided by Epic Games.
Packaging was done with Development.
All sounds to play in the editor play just fine.

I found out that the sound cue was the problem and put it into the sound wave, but the same problem still occurs.
I am currently changing to a meta sound source. Is there a cause and solution to this problem?