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FreakyChest
Inspiring
December 9, 2025
Question

NPCs break triggers when simulating

  • December 9, 2025
  • 4 replies
  • 170 views

If you stop simulation in Horizon Desktop Editor while NPC is in trigger, it will break trigger for that NPC. Once broken, any time simulation is started, the trigger will trigger for that NPC right away and then will not trigger again for that NPC. 

Currently resetting world fixes the issue and I would assume this does not affect published worlds (since it is related to stopping simulation).

Image below just shows the setup I used to recreate bug, I was able to break each trigger by stopping simulation when NPC was in trigger. I attempted with real player and no issue occured.

 

4 replies

gausroth
gausroth
Honored Contributor
December 10, 2025

This is a known issue. The problem is that one player exit trigger never fires for the trigger if a player or NPC is inside the trigger when the world stops or the player goes into build mode. Please file a bug report for this.

GitHub: https://github.com/Gausroth/HorizonWorldsTutorials.git Discord: https://discord.gg/hNyDQwdw4N YouTube: https://www.youtube.com/@GausRothTutorials
    FreakyChestAuthor
    Inspiring
    December 11, 2025

    I tested it, and did not see the problem occur with player (tested this and can not produce bug with player), only happens with NPC. 

    Made bug report with video and voice over going over issue and showing could not be reproduced with real player. Doesn't mean it can't happen, just in my testing it did not happen. 

    gausroth
    gausroth
    Honored Contributor
    December 11, 2025

    Interesting, maybe they fixed the player part of the bug then. 

    GitHub: https://github.com/Gausroth/HorizonWorldsTutorials.git Discord: https://discord.gg/hNyDQwdw4N YouTube: https://www.youtube.com/@GausRothTutorials
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