Spectating a creeper, spider or enderman applies the player a post effect. However these effects can’t be listed or removed with the new posteffect command. This means it’s impossible to remove these effects while spactating those mobs even though there is a command supposed to remove post effects from the player.
Steps to reproduce:
Summon a creeper and start spectating it.
Run /posteffect list @s. It will say that you don’t have any post effects instead of listing the creeper effect.
Run /posteffect remove @s creeper. It will fail instead of removing the effect.
Fixing this would allow MC-249500 to be fixed too.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
Full Version History – Snapshot Version History – The official Minecraft feedback site
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki