diff --git a/addons/geary-prefabs/src/commonMain/kotlin/com/mineinabyss/geary/prefabs/configuration/components/EntityObservers.kt b/addons/geary-prefabs/src/commonMain/kotlin/com/mineinabyss/geary/prefabs/configuration/components/EntityObservers.kt
index 6e67756c..e5845481 100644
--- a/addons/geary-prefabs/src/commonMain/kotlin/com/mineinabyss/geary/prefabs/configuration/components/EntityObservers.kt
+++ b/addons/geary-prefabs/src/commonMain/kotlin/com/mineinabyss/geary/prefabs/configuration/components/EntityObservers.kt
@@ -28,7 +28,9 @@ class EventBind(
     class CachedEvent(val componentId: ComponentId, val data: Any?)
 
     @Transient
-    val emitEvents = emit.map {
-        if (using != null) ReEmitEvent(SerializableComponentId(using.id), it) else it
+    val emitEvents = emit.flatMap { emitter ->
+        emitter.map { component ->
+            if (using != null) ReEmitEvent(SerializableComponentId(using.id), component) else component
+        }
     }.map { CachedEvent(componentId(it::class), it) }
 }
diff --git a/addons/geary-prefabs/src/jvmTest/kotlin/com/mineinabyss/geary/prefabs/observers/ConfigEntityObserversTests.kt b/addons/geary-prefabs/src/jvmTest/kotlin/com/mineinabyss/geary/prefabs/observers/ConfigEntityObserversTests.kt
new file mode 100644
index 00000000..6a96e7d9
--- /dev/null
+++ b/addons/geary-prefabs/src/jvmTest/kotlin/com/mineinabyss/geary/prefabs/observers/ConfigEntityObserversTests.kt
@@ -0,0 +1,74 @@
+package com.mineinabyss.geary.prefabs.observers
+
+import com.mineinabyss.geary.modules.TestEngineModule
+import com.mineinabyss.geary.modules.geary
+import com.mineinabyss.geary.prefabs.Prefabs
+import com.mineinabyss.geary.prefabs.configuration.components.EntityObservers
+import com.mineinabyss.geary.serialization.dsl.serialization
+import com.mineinabyss.geary.serialization.dsl.withCommonComponentNames
+import com.mineinabyss.geary.serialization.formats.YamlFormat
+import com.mineinabyss.geary.serialization.serializableComponents
+import com.mineinabyss.geary.serialization.serializers.GearyEntitySerializer
+import com.mineinabyss.geary.systems.builders.observeWithData
+import com.mineinabyss.idofront.di.DI
+import io.kotest.assertions.print.Print
+import io.kotest.matchers.shouldBe
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.serializer
+import org.junit.jupiter.api.BeforeEach
+import org.junit.jupiter.api.Test
+
+class ConfigEntityObserversTests {
+    @Serializable
+    @SerialName("geary:print")
+    data class Print(val string: String)
+
+    @Serializable
+    @SerialName("geary:my_comp")
+    class MyComp()
+
+    @BeforeEach
+    fun createEngine() {
+        DI.clear()
+        geary(TestEngineModule) {
+            install(Prefabs)
+
+            serialization {
+                withCommonComponentNames()
+
+                components {
+                    component(String.serializer())
+                    component(Print.serializer())
+                    component(EntityObservers.serializer())
+                    component(MyComp.serializer())
+                }
+            }
+        }
+        geary.pipeline.runStartupTasks()
+    }
+
+    @Test
+    fun `should correctly add temporary and persisting components with CopyToInstances`() {
+        // arrange
+        val entityDef = """
+        geary:observe:
+          - event: geary:onSet
+            involving: [ geary:myComp ]
+            emit:
+              - geary:print:
+                  string: "Hello World"
+        """.trimIndent()
+
+        val format = YamlFormat(serializableComponents.serializers.module)
+        val entity = format.decodeFromString(GearyEntitySerializer, entityDef)
+        val printed = mutableListOf<String>()
+        geary.observeWithData<Print>().exec { printed += event.string }
+
+        // act
+        entity.set(MyComp())
+
+        // assert
+        printed shouldBe listOf("Hello World")
+    }
+}
diff --git a/addons/geary-serialization/src/commonMain/kotlin/com/mineinabyss/geary/serialization/formats/Format.kt b/addons/geary-serialization/src/commonMain/kotlin/com/mineinabyss/geary/serialization/formats/Format.kt
index 302e9cd3..c90e3144 100644
--- a/addons/geary-serialization/src/commonMain/kotlin/com/mineinabyss/geary/serialization/formats/Format.kt
+++ b/addons/geary-serialization/src/commonMain/kotlin/com/mineinabyss/geary/serialization/formats/Format.kt
@@ -8,6 +8,13 @@ import okio.Path
 interface Format {
     val ext: String
 
+    fun <T> decodeFromString(
+        deserializer: DeserializationStrategy<T>,
+        string: String,
+        overrideSerializersModule: SerializersModule? = null,
+        configType: ConfigType = ConfigType.REGULAR,
+    ): T
+
     fun <T> decodeFromFile(
         deserializer: DeserializationStrategy<T>,
         path: Path,
diff --git a/addons/geary-serialization/src/jvmMain/kotlin/com/mineinabyss/geary/serialization/formats/YamlFormat.kt b/addons/geary-serialization/src/jvmMain/kotlin/com/mineinabyss/geary/serialization/formats/YamlFormat.kt
index 2feca5f3..c0ab4a82 100644
--- a/addons/geary-serialization/src/jvmMain/kotlin/com/mineinabyss/geary/serialization/formats/YamlFormat.kt
+++ b/addons/geary-serialization/src/jvmMain/kotlin/com/mineinabyss/geary/serialization/formats/YamlFormat.kt
@@ -52,11 +52,12 @@ class YamlFormat(
         return Yaml(module, config).decodeFromStream(deserializer, inputStream())
     }
 
-    fun <T> decodeFromString(
+
+    override fun <T> decodeFromString(
         deserializer: DeserializationStrategy<T>,
         @Language("yaml") string: String,
-        overrideSerializersModule: SerializersModule? = null,
-        configType: ConfigType = ConfigType.REGULAR,
+        overrideSerializersModule: SerializersModule?,
+        configType: ConfigType
     ): T {
         return decodeFromStream(deserializer, overrideSerializersModule, configType) { string.byteInputStream() }
     }