After getting stuck piders don't move and don't react to me, day or night. A blow with a sword doesn't help. It happens quite often and in different places.
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I can confirm this issue. I generated my world in 1.15.2 but I've been playing with the latest nether update snapshots as they come out. When I explore mineshafts, I often see cave spiders, and when they try to chase me down a hallway with those oak fence "supports" on the side, the spiders often hit the fence posts, and instead of pathfinding between them, they climb up them and get stuck in the ceiling. I have noticed this almost consistently when dealing with spiders, if I get behind something that the spider can climb up, with a block on top (doesn't have to be a corner), and I stand directly behind it while they try to follow me, they get stuck.
How to recreate: (I was using 20w16a of the nether update when I did this, but have noticed the issue since 1.15.2)
1) Create a superflat world with bedrock and more than 40 layers of dirt (so slimes don't spawn) without structures on creative mode.
2) Set gamerule doMobSpawning to false.
3) Build an upside-down L out of dirt blocks, 3 blocks tall, and one block out (see picture "2020-04-19_10.16.14" that I attached)
4) Spawn a spider or cave spider with a spawn egg, set the gamemode to survival, and time to night so the spider will follow you. (when I did this with the cave spider, I also gave myself an enchanted golden apple and a potion of night vision)
5) With the spider following you, run away from the L in the direction it is pointing. Once you are twenty or so blocks away, turn around and go back to the L and hide right behind it so the spider approaches the L on the side where the L is pointing.
6) When the spider reaches the L, it will climb up the dirt blocks and get stuck once it hits the top block of the L. You can then move and walk around, it is still dark and the spider looks at you and turns its body like it wants to follow you, but can't. It is stuck in the ceiling somehow.
Note 1: When I save and exit the world, and then reload it, the spider is back on the ground and can follow me like normal. But, it will get stuck again if I do the same thing.
Note 2: Hitting the spider so the knockback eventually pushes it out of the block will also get it unstuck. You can also push it out with the player, but the spider is unable to attack or poison no matter how close I get or even push it, until it gets unstuck.
Note 3: This also works if the ceiling block is a slab, or if the tower is 20+ blocks tall
In the meantime while this gets fixed, exploring mineshafts is much easier, you can even use this bug to make clearing out cave spider spawners a breeze.
Please fix, thanks mojang!
edit: I'm running Windows 10 and I always install the latest updates.
This is now even more of an issue with the introduction of trial chambers - spiders spawned there will often get stuck in high places where you won't see them, meaning you won't be able to complete the trial spawner and get the loot. This detracts from the experience significantly.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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Why would this be working as intended? my expectation would be that as soon as a player is in aggro range their behavior should reset to targetting the player instead of perpetual corner bumping.
Can I have a screenshot of the debug screen?