Subtitles "entity.horse.ambient" and "entity.horse.angry" are identical, but show separately

The two translation strings subtitles.entity.horse.ambient and subtitles.entity.horse.angry both are translated as "Horse neighs" in en_US, but show up separately in the subtitles.

To reproduce

1. Enable subtitles

2. Summon a horse

3. Click on it while holding an item

4. With some luck, it'll play the ambient sound
   → ❌ Two identical subtitles are displayed

Video