[MCPE-17220] Mobs can see other mobs without line of sight.

On my survival world I have had some interesting things happening.
I have seen a baby zombie stuck staring at the ground. I hit it it got knocked back ran back to where it was and was looking down again. I made a copy of the world and went into creative and found a cave about 10 blocks below the zombie. It may have been trying to mount a zombie thag was in there (but had since despawned or wandered off before I could see it,)

An other example is me being in my house near a wall and a creeper attacks me from the other side. I had no transparent blocks around me as a zombie broke my door which I replaced with blocks. So the creeper attacked without a line of sight.

So the zombie saw a another mountable mob through the ground and the creeper attacked me through a wall.
The image is of the baby zombie,

Linked issues

is duplicated by 10

MCPE-17247 Creeper perceive the player through the wall and explodes out of house Resolved

MCPE-17282 mobs can see through blocks Resolved

MCPE-17422 Creepers explode with closed door Resolved

MCPE-17505 Ghasts agro Resolved

MCPE-17587 Mob cab see player or another mob behind a solid wall Resolved

5 more links

relates to 1

MCPE-11015 No breaking animation when doors attacked by mobs Resolved

Attachments

MCPE-17220.mcworld

Minecraft_ Windows 10 Edition Beta 11_14_2016 12_18_58 AM.png

Minecraft_ Windows 10 Edition Beta 11_14_2016 12_20_25 AM.png

Comments 30

ken aresthus 2016-09-27T11:29:33Z

Oops, accidentally duplicate this post (>_<) sorry! But yes, mob can attack through block. Thats bad thing on survival. I can't build house this way.

Jorge Serrato 2016-10-10T01:51:35Z

This bug is still present on the latest beta. Also I would like to provide a video where I showcase this bug with creepers exploding https://youtu.be/Pi-Jz0jnFwA

[Mojang] Mega_Spud (Jay) 2016-10-16T20:04:33Z

Affects ghasts too according to MCPE-17505.

Mustafa Alperen SEKİ 2016-10-22T15:49:09Z

I think ghast thing is WAI. Ghasts afaik have a large range in PC edition too and i think it is what should happen.

Specialistol 2016-11-14T08:58:44Z

(Windows 10, survival, 0.16.1)
I think this is the same issue. Attaching images that capture the love story between a zombie and a snow golem. Neither would react to out stimulus (like slimes attacking the golem, or me going near the zombie). funny enough, this is the second snow golem to stuck in the same place, targeting the same zombie. I killed one thinking that next one would be fine, but no the second one also got stuck on the same zombie. I estimate the distance between them to contain a solid 7 block wall, possibly more.
After I killed the zombie, the golem got stuck on some other mob, possibly a slime, since his head was following something that is bouncing. When I stood near him, I was not able to hear a slime jump, nor was I able to find its new target.

20 more comments

AMAN4700 2016-11-18T04:34:29Z

This is a bulk resolve of issues that haven't been updated to 0.16.0+ yet. Please comment below (To open the ticket) and update your affected versions. If you cannot reproduce the bug, please write in the comments so we can resolve it as "Cannot Reproduce". Thank You!

Specialistol 2016-11-18T08:09:28Z

Like the comment above says, affects 0.16.1.

Specialistol 2016-11-20T03:29:34Z

... 0.16.2 as well

Lio 2016-12-24T00:34:22Z

Please Mark this Issue to 1.0.0 in "Affects Versions". Because this Bug is happening in this version

Specialistol 2016-12-24T02:45:13Z

Yes, still happens in 1.0.0.

Lio 2016-12-24T12:56:39Z

This Issue Still exists in 1.0.0

[Mojang] Mega_Spud (Jay) 2017-01-09T13:39:36Z

Attached test world to reproduce this issue.

Specialistol 2017-02-12T02:34:31Z

Affects 1.0.3

PHO 2017-04-11T23:56:51Z

Confirmed in 1.0.6 (at least for slimes).

Specialistol 2017-06-04T19:00:51Z

Persists in 1.1 (Snow golem - slime)

Jeff White 2017-06-05T03:03:44Z

Can we bump up the priority of this? This bug was one of the reasons I stopped playing the game, as I couldn't defend my bases from Creepers. Thanks!

Jeff White 2017-07-04T21:36:25Z

Persists in 1.1.2 . (Creepers are able to see through walls after being hit with a weapon.)

Matt Smith 2017-07-06T16:05:27Z

This explains why blaze are tracking me through glass-- thought I had to use a non-transparent block but it appears they will track me through any blocks according to this bug.

Jeff White 2017-08-06T00:44:36Z

Still present in 1.1.5. Has any developer even looked at this?

Shannon 2017-08-06T06:06:38Z

Yes creepers will blow up if you hit them and close the door they'll blow up your house! I'm in beta build 2 1.2.0.7

Shelly Hardic 2017-09-13T02:26:57Z

Effects Windows 10 edition and Pocket Edition on Ipad. Version 1.1.15 (lastest ipdate nom beta) In my grinder without any line of sight, one non kill hit and the creeper explodes. I am tired of fixing my grinder please fix!

Jeff White 2017-09-22T16:56:09Z

Still present in 1.2

Jameson York 2017-10-10T03:46:17Z

Issue continues to exist in 1.2.2 on both XBox One and Windows 10. Mob outside house (witch) tracks player inside with no line-of-sight in Survival, and snowmen track Endermen who teleport into undiscovered subterranean cave systems to get away from the snowballs (stare at ground clustered around as close as they can get) in Creative (and probably Survival mode, but not tested).

Adrian Mignogna 2017-10-23T07:42:14Z

Issue still present in 1.2.3

Auldrick 2017-10-23T14:00:56Z

I was able to reproduce this problem in 1.2.3.6 with a witch and me separated by a 2-high cobblestone wall. (I used a second player in Creative mode to spawn the witch and observe.) At first the witch was unaware of me. When I started jumping in place so it could see I was there, its head bobbed up and down with my jumping (as seen by the observer) but it was not tracking me at that point; it would still break contact and wander randomly. But once I showed myself long enough for it to target me, from then on it was able to track me through the wall. It continued tracking me until I moved a certain distance away, at which point it took a potion of Night Vision and resumed tracking me. When I moved still farther away, it stopped targeting me and began to wander again. When I returned, it was no longer tracking me at first, but as soon as I got very close to the wall it resumed tracking and targeting me through the wall without having seen me again.

One interesting note is that at one point in my testing the witch hit me with a potion. After I drank milk to cancel the poison effects, the witch starting taking damage, which caused it to consume another potion. I believe the witch's damage was caused by my drinking milk, but I didn't know such an effect existed.

In addition, when I used the Creative observer to kill the witch, it threw a potion and my player took full damage (down to 1/2 heart) despite being 8 blocks away and separated by the wall.

Auldrick 2017-10-23T15:09:47Z

I repeated the preceding experiments with a creeper. There was no sign that the creeper was able to see me through a cobblestone wall, even after it had started sizzling, except that if I remained next to the wall it exploded but if I backed away in time it stopped its attack. But if I backed away successfully, I could come back up against the wall immediately opposite to it and it would not re-trigger unless I jumped and it saw me and started a new attack, so it can only detect me through the wall while it is triggered. I assume the reports above of creepers exploding outside a wall or door are cases where the player did not move away quickly enough after the creeper triggered.

Auldrick 2018-01-16T21:30:01Z

The experiment with the witch continues to affect 1.2.9.1.

Jeff White 2018-01-16T21:46:06Z

Yea the simplest example I could come up with was building a wall about 4-5 opaque blocks tall. If you then peek your head above the wall to look at a Creeper on the other side of the wall about 10-16 blocks away, he'll start walking toward you. Then lower yourself, and stay hidden right behind the wall, and despite the Creeper not being able to see you at all, once he gets within 3 blocks, he will still explode.

This is certainly not the behavior on the pre-Bedrock editions nor the Legacy Console edition.

Auldrick 2018-01-17T00:59:47Z

I tested what Jeff White described and learned a couple more things. If a creeper detects you, it makes you its target. If it is unable to come within attack range because of an obstacle, it will nevertheless sometimes continue to track you, staying as close as possible even if it can no longer see you. If you move a certain distance away, it will seem to break off, but if you return it will resume tracking you, even if it could not see you leave or return. In other words, losing line of sight does not always cause tracking to stop.

If at any point while targeting you the creeper gets within about 3 blocks, it will sizzle but will not explode unless it can actually see you. That will end its tracking until it sees you again.

Although 1.2.9 fixed it so that a creeper won't explode if it can't see you, that only changes the problem to a different one: The creeper may track you as you move around your shelter, and when you open a door to the outside, it will be right there ready to explode.

Tyler Erickson 2019-03-21T18:46:49Z

Bedrock 1.10 is having this issue with zombies. Wiki says zombies can target Villagers even through walls but have never encountered this until 1.10. Villages generated near water have Drowned sieges as soon as it is dark, with the Drowned lining up at the edge of the water during the day time.

Along with Villagers now not closing doors behind them, it's near impossible to not lose Villagers every single night. I have to, quite literally, fence them in which is no fun for a lively village.