When equipped by Players the Piglin Head ears are moving strangely. Piglin Head Ears will move correctly when the player wearing it moves continuously, but when moving little by little and you stopped the ears are like frozen, even when the player wearing it jumps in place the ears won't move.
Thank you for your report!
However, this issue has been closed as Working as Intended.
If you need help or have a suggestion you might like to follow a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki