minecraft:entity.happy_ghast.riding has no associated subtitles, compared to other happy ghast sounds or any similar ambient sound effects.
To reproduce:
Enable “Show Subtitles” option in the Accessibility Settings menu
Use the
/playsound minecraft:entity.happy_ghast.ridingcommand; it is missing any subtitlesCompare with other happy ghast sounds (
minecraft:entity.happy_ghast) or similar ambient sound effects, as using Elytra (minecraft:item.elytra.flying)
I can confirm this, but the "Swoosh" subtitle for the sound minecraft:item.elytra.flying doesn't appear when flying with an elytra either, only when played via /playsound.