Why doesn't my Event Dispatcher bind in Construction Script work?

Construction Script runs in editor too and on every property change. Each run wipes prior bindings. Bind in BeginPlay so it happens once at runtime.

What about persistent state in Construct?

Use Construct only for setup that's safe to repeat (mesh assignment, default visibility). Anything stateful (bindings, timers) in BeginPlay.

Yes. Unbind to avoid dangling references when objects destruct. Pair every Bind with a corresponding Unbind in EndPlay.

Fix: Unreal Event Dispatcher Bound In Construct Doesn't Fire

Quick answer: Bind Event Dispatchers in BeginPlay, not Construction Script. Unbind in EndPlay.

Construction Script binds OnDamageDealt to a function. Run game; damage fires; nothing happens. Editor re-running Construct each frame in PIE wipes the binding.

The Fix

BP Event Graph:

BeginPlay:
  Get HealthComponent
  → Bind Event to OnDamageDealt(HandleDamage)

EndPlay:
  Get HealthComponent
  → Unbind Event from OnDamageDealt(HandleDamage)

BeginPlay runs once per actor lifetime. Construction Script runs many times during edit and instantiation, defeating bindings.

Verifying

Damage handler fires. EndPlay cleans up. Re-bind in Construct: handler doesn’t fire after first PIE compile.

“BeginPlay binds. EndPlay unbinds. Dispatcher fires.”

Related Issues

For replication scope, see replication scope. For Set Timer handle, see timer handle.

BeginPlay for binding. Dispatcher fires.