The following groups of translation strings are identical, but show up separately in the subtitles:

• "Parrot groans"
  • subtitles.entity.parrot.imitate.husk
  • subtitles.entity.parrot.imitate.zombie
  • subtitles.entity.parrot.imitate.zombie_villager
• "Parrot growls"
  • subtitles.entity.parrot.imitate.hoglin
  • subtitles.entity.parrot.imitate.zoglin
• "Parrot hisses"
  • subtitles.entity.parrot.imitate.creeper
  • subtitles.entity.parrot.imitate.silverfish
  • subtitles.entity.parrot.imitate.spider
• "Parrot murmurs"
  • subtitles.entity.parrot.imitate.evoker
  • subtitles.entity.parrot.imitate.illusioner
  • subtitles.entity.parrot.imitate.pillager
• "Parrot rattles"
  • subtitles.entity.parrot.imitate.skeleton
  • subtitles.entity.parrot.imitate.stray
  • subtitles.entity.parrot.imitate.wither_skeleton
• "Parrot squishes"
  • subtitles.entity.parrot.imitate.magma_cube
  • subtitles.entity.parrot.imitate.slime
• "Parrot moans"
  • subtitles.entity.parrot.imitate.guardian
  • subtitles.entity.parrot.imitate.elder_guardian
• "Parrot snorts"
  • subtitles.entity.parrot.imitate.piglin
  • subtitles.entity.parrot.imitate.piglin_brute

Video

Minecraft 1.16.5 - Singleplayer 2021-02-14 00-30-34.mp4

Can be reproduced similarily for all other groups of mobs mentioned above.