[MCPE-185960] Trial spawners that have had spawn eggs used on them revert to their initial state after their cooldown expires

Just updating this as I've figure out the exact issue

Get a Trial Spawner or save a structure with a Trial Spawner in it
Place the Trial Spawner or load it from a Structure Block
Use a Spawn Egg on it
Defeat all mobs in the Trial Spawner
Wait 30 minutes for the reset (The pinned comment says you have to go into creative during this time)
You will notice that it either has no mob or has the original mob spawning instead of what you put into it

While I haven't tested it on ones in a trial chamber this likely is an issue on them as well.

Linked issues

is duplicated by 1

MCPE-186879 Trial spawners forget their designated mob when placed by player out of creative mode, assigned by spawn eggs Resolved

relates to 2

MC-273635 Trial spawners forget their designated mob when placed by player out of creative mode, assigned by spawn eggs Resolved

MCPE-186484 Player-Placed Trial Spawners corrupted after cooldown Reopened

Attachments

Trial spawners.mcworld

Comments 17

migrated 2024-08-23T00:49:23Z

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GreasyBat735419 2024-08-23T14:08:32Z

Are you definitely killing all the mobs?

Jarl-Penguin 2024-08-23T14:12:55Z

@unknown: If they didn't kill all of the mobs the trial spawner wouldn't deactivate in the first place.

Yur4 2024-08-25T23:32:34Z

I can confirm that I'm killing all the mobs, you literally can't get loot if you don't finish it

Yur4 2024-08-30T06:13:31Z

Ok I have an update to the exact issue, if you use spawn eggs specifically it will revert the mob upon completion to either what is was before or nothing depending on if you placed it through a structure block or yourself. This probably applies to natural trial spawners. I'm gathering video to show the issue.

7 more comments

Yur4 2024-08-30T06:51:11Z

Ok so here is a link to the issue since I tried cutting the time down, but the upload limit was too small. This is a link showing that I put a spawn egg into the trial spawner and it reverts to its initial state of how it was when it was put into the world https://youtu.be/3VTtADIvQz8

KR_ 2024-09-12T07:14:28Z

Can confirm, affects preview 1.21.40.21. For a more comprehensive breakdown of what is going on, please refer to MCPE-186484

Steps to reproduce:

Use a trial spawner that already has data assigned to it (i.e already has a mob inside it). Use either a naturally spawned one from a trial chamber, or use a structure block to copy a natural one.
Assign a different mob by using its respective spawn egg.
Activate it and kill all the mobs.
Wait for the 30 minute cooldown to expire.
Make sure your gamemode is set to creative before the cooldown expires. So that when it does, you're still in creative mode
Set your gamemode to survival mode after the cooldown has expired.

Observed results:
After the cooldown expires, the trial spawner will appear as empty (since you're in creative), but it will still behave as if it were active. As soon as you set your gamemode to survival, the trial spawner will revert to its original state, and function normally. Additionally, reloading the world will also help reset it back to its active state from its pseudo-empty one.

Expected results:
After the cooldown, the trial spawner should retain the mob that you assigned it, and not appear as "corrupted" if your gamemode is set to creative after said cooldown expires.

Yur4 2024-09-12T07:39:58Z

It actually doesn't matter whether or not you enter creative before the cooldown or not, the result is the same for one's placed by the player. I even show this by sitting in survival in a video posted within my pinned comment. Though if it is corrupted, its probably a problem with the reset process itself. However, my video shows results that it 100% is going to its initial placed state as placing the trial spawners without the structure block does leave it blank, while using structure block for the data of a natural one resets it to the original mob.

Yur4 2024-09-13T20:21:45Z

To show that the 5th step stated by KR_ is unnecessary to having the bug happen:
https://youtu.be/Y9I_zuqrn1A

KR_ 2024-09-14T06:19:22Z

Thank you for the video Nick, however, my comment about your gamemode having to be set to creative was only about reproducing the part of this bug, similarly to MCPE-186484, in which the trial spawner becomes active after the cooldown, but appears as completely empty until you either reload the world or change your gamemode. It isn't necessary to be in creative to reproduce the part involving the loss of data. Apologies if I never gave a proper explanation.

Qwertgod 2024-09-24T18:23:43Z

Still having this issue. In a realm where the gameode is set to survial, I have one account on survial and a second one in creative. Using the creative account, I place a new spawner and then place the mob egg in, then log the creative account out of the realm. Then, I battle with my survial account kill all the mobs and when the 30 minute cooldown is over, the spawner losses the mob and reverts to an empty one.

I am able to come back with the creative account and replace the mob egg, but the spawner will still lose the mob after the fight.

I hope this gets fixed soon becuase the potential for creating maps is limitless if they get this fixed.

migrated 2024-09-24T18:23:43Z

I am able to come back with the creative account and replace the mob egg, but the spawner will still lose the mob after the fight.

I hope this gets fixed soon becuase the potential for creating maps is limitless if they get this fixed.

Yur4 2024-09-25T05:12:34Z

I agree, if you want to set up something for an adventure map, just use structure blocks and put them in that way. Since the data for the trial spawners from there works fine outside of changing it with spawn eggs currently.

Qwertgod 2024-10-31T15:48:40Z

Still having this issue and reloading the world does not work. I watched Nick Stories videos and notice that, when he is using a structure block, the trail spawner reverted to Zomibies in place of the Glow Squid or Cow he placed in. Nick Story, did you place the spawner as a zombie before the structure block? I am trying to see if there is a way to have the sturcture block remeber the mob placed so that I can use the trail spawners as intended until this is fixed. Thanks for the help!

migrated 2024-10-31T15:48:40Z

Lyndsbal 2025-01-02T21:54:53Z

This issue is still occuring in 1.21.51 and needs to be reopened. Still happening in my worlds

Alexander 2025-03-04T19:58:47Z

I’m having the same issue