Playing an empty sound event or /playsound with volumn 0 does not shows subtitles

The Bug

An empty sound means, in the sounds json, the "sounds" of it is undefined. It will be regarded valid, because it can be in the tab-complete list in the /playsound cmd. But, it displays no subtitle.
Also, /playsound a valid sound event while setting the volumn parameter 0, the subtitle will not be shown. That means, it seems impossible to show a subtitle without playing a sound.

Reproduce

/playsound minecraft:block.note_block.banjo block @s ~ ~ ~ 0 1

I can make sure I opened displaying subtitles in the option. If the volume is 0.1, the subtitle will show.

Expected Result

A subtitle would show