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.
All sounds play fine when playing in the editor.

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 for this problem?

I have the exact same problem! Is there something we should do? I want to switch my sounds with the variant manger… Isn’t it possible in a package?

Thanks in advance, Philipp