Blueprint nodes disappear graph and values changing after I relaunch Project?

Development Programming & Scripting
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As you can see underlined in red, either nodes were completely gone or replaced with a custom event.

Functions and events are both interface functions. I’m sure I saved before I closed project and when I loaded it up few hours later code stopped working and this was why.

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Additionally I been having problems with Behavior Tree, In my task I would have a blackboard key selector variable and it would change the value by itself. The Task_Focus “Focus Target” blackboard key selector should be set to “AttackTarget”, however sometimes it would change to “SelfActor” for some reason… after relaunching prj.

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Also my mesh for the AI character just reset itself too.

1 Like
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It just happened again guys, 6 hours later I suffer the same problem… after connecting and making everything works unreal just decided to make my interface event into a custom function.

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I am having the same issues. hopefully this gets looked at because my nodes just disappear after saving and committing to revision.

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This issue is likely due to a corrupted Blueprint or a problem with saving changes. To resolve:

  1. Save Correctly: Always save your Blueprint before closing the project.
  2. Check for Corruption: If nodes disappear, the Blueprint might be corrupted—try recreating it.
  3. Recompile: Recompile and resave the Blueprint before closing the project.
  4. Engine Version: Ensure you’re using a stable version of Unreal Engine.

If the problem persists, consider migrating the Blueprint to a new project.

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