Piglins celebrate even though their enemies are not killed by themselves

The bug

Piglins celebrate / play their celebrating sounds even if they didn't kill their enemy by themselves.

To reproduce

1. Summon some piglins
2. Spawn a hoglin (or a wither skeleton)
3. Wait for the piglin to notice with the hoglin / wither skeleton
4. Kill the hoglin / wither skeleton
   → The piglins will celebrate

Video

Minecraft 20w11a - Singleplayer 2020-03-14 13-56-55.mp4