diff --git a/tests/pixi.js/check-3/e/eventemitter3/project/build.properties b/tests/pixi.js/check-3/e/eventemitter3/project/build.properties
new file mode 100644
index 0000000000..b1e589d9f4
--- /dev/null
+++ b/tests/pixi.js/check-3/e/eventemitter3/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.7.1
\ No newline at end of file
diff --git a/tests/pixi.js/check-3/e/eventemitter3/project/plugins.sbt b/tests/pixi.js/check-3/e/eventemitter3/project/plugins.sbt
new file mode 100644
index 0000000000..efff5a7004
--- /dev/null
+++ b/tests/pixi.js/check-3/e/eventemitter3/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("org.scala-js" %% "sbt-scalajs" % "1.10.0")
diff --git a/tests/pixi.js/check-3/p/pixi__utils/build.sbt b/tests/pixi.js/check-3/p/pixi__utils/build.sbt
index 02261eaa1e..df403ca168 100644
--- a/tests/pixi.js/check-3/p/pixi__utils/build.sbt
+++ b/tests/pixi.js/check-3/p/pixi__utils/build.sbt
@@ -1,6 +1,6 @@
 organization := "org.scalablytyped"
 name := "pixi__utils"
-version := "0.0-unknown-98d092"
+version := "0.0-unknown-05e0f6"
 scalaVersion := "3.1.2"
 enablePlugins(ScalaJSPlugin)
 libraryDependencies ++= Seq(
diff --git a/tests/pixi.js/check-3/p/pixi__utils/project/build.properties b/tests/pixi.js/check-3/p/pixi__utils/project/build.properties
new file mode 100644
index 0000000000..b1e589d9f4
--- /dev/null
+++ b/tests/pixi.js/check-3/p/pixi__utils/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.7.1
\ No newline at end of file
diff --git a/tests/pixi.js/check-3/p/pixi__utils/project/plugins.sbt b/tests/pixi.js/check-3/p/pixi__utils/project/plugins.sbt
new file mode 100644
index 0000000000..efff5a7004
--- /dev/null
+++ b/tests/pixi.js/check-3/p/pixi__utils/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("org.scala-js" %% "sbt-scalajs" % "1.10.0")
diff --git a/tests/pixi.js/check-3/p/pixi__utils/src/main/scala/typings/pixiUtils/mod.scala b/tests/pixi.js/check-3/p/pixi__utils/src/main/scala/typings/pixiUtils/mod.scala
index 25da9408c0..f2a1117c45 100644
--- a/tests/pixi.js/check-3/p/pixi__utils/src/main/scala/typings/pixiUtils/mod.scala
+++ b/tests/pixi.js/check-3/p/pixi__utils/src/main/scala/typings/pixiUtils/mod.scala
@@ -29,10 +29,11 @@ object mod {
     val EventEmitter: EventEmitterStatic = js.native
     
     /* This class was inferred from a value with a constructor, it was renamed because a distinct type already exists with the same name. */
-    @JSImport("@pixi/utils", "EventEmitter.EventEmitterCls")
+    @JSImport("@pixi/utils", "EventEmitter.EventEmitter")
     @js.native
     open class EventEmitterCls[EventTypes] ()
-      extends typings.eventemitter3.mod.EventEmitterCls[EventTypes]
+      extends StObject
+         with typings.eventemitter3.mod.EventEmitter[EventTypes]
     
     type _To = js.Object & EventEmitterStatic
     
diff --git a/tests/pixi.js/check-3/p/pixi_dot_js/build.sbt b/tests/pixi.js/check-3/p/pixi_dot_js/build.sbt
index f9dff1779d..d0a99fc837 100644
--- a/tests/pixi.js/check-3/p/pixi_dot_js/build.sbt
+++ b/tests/pixi.js/check-3/p/pixi_dot_js/build.sbt
@@ -1,12 +1,12 @@
 organization := "org.scalablytyped"
 name := "pixi_dot_js"
-version := "0.0-unknown-3024a5"
+version := "0.0-unknown-ba7eae"
 scalaVersion := "3.1.2"
 enablePlugins(ScalaJSPlugin)
 libraryDependencies ++= Seq(
   "com.olvind" %%% "scalablytyped-runtime" % "2.4.2",
   "org.scalablytyped" %%% "eventemitter3" % "0.0-unknown-292498",
-  "org.scalablytyped" %%% "pixi__utils" % "0.0-unknown-98d092")
+  "org.scalablytyped" %%% "pixi__utils" % "0.0-unknown-05e0f6")
 publishArtifact in packageDoc := false
 scalacOptions ++= List("-encoding", "utf-8", "-feature", "-language:implicitConversions", "-language:higherKinds", "-language:existentials", "-no-indent", "-source:future")
 licenses += ("MIT", url("http://opensource.org/licenses/MIT"))
diff --git a/tests/pixi.js/check-3/p/pixi_dot_js/project/build.properties b/tests/pixi.js/check-3/p/pixi_dot_js/project/build.properties
new file mode 100644
index 0000000000..b1e589d9f4
--- /dev/null
+++ b/tests/pixi.js/check-3/p/pixi_dot_js/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.7.1
\ No newline at end of file
diff --git a/tests/pixi.js/check-3/p/pixi_dot_js/project/plugins.sbt b/tests/pixi.js/check-3/p/pixi_dot_js/project/plugins.sbt
new file mode 100644
index 0000000000..efff5a7004
--- /dev/null
+++ b/tests/pixi.js/check-3/p/pixi_dot_js/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("org.scala-js" %% "sbt-scalajs" % "1.10.0")
diff --git a/tests/pixi.js/check-3/p/pixi_dot_js/src/main/scala/typings/pixiJs/mod.scala b/tests/pixi.js/check-3/p/pixi_dot_js/src/main/scala/typings/pixiJs/mod.scala
index 98c4de98c0..f52db46e6c 100644
--- a/tests/pixi.js/check-3/p/pixi_dot_js/src/main/scala/typings/pixiJs/mod.scala
+++ b/tests/pixi.js/check-3/p/pixi_dot_js/src/main/scala/typings/pixiJs/mod.scala
@@ -21,7 +21,7 @@ object mod {
       @js.native
       open class ^[EventTypes] ()
         extends StObject
-           with typings.pixiUtils.mod.^[EventTypes]
+           with typings.eventemitter3.mod.EventEmitter[EventTypes]
       
       @JSImport("pixi.js", "utils.EventEmitter")
       @js.native
@@ -31,10 +31,11 @@ object mod {
       val EventEmitter: EventEmitterStatic = js.native
       
       /* This class was inferred from a value with a constructor, it was renamed because a distinct type already exists with the same name. */
-      @JSImport("pixi.js", "utils.EventEmitter.EventEmitterCls")
+      @JSImport("pixi.js", "utils.EventEmitter.EventEmitter")
       @js.native
       open class EventEmitterCls[EventTypes] ()
-        extends typings.pixiUtils.mod.EventEmitter.EventEmitterCls[EventTypes]
+        extends StObject
+           with typings.eventemitter3.mod.EventEmitter[EventTypes]
       
       type _To = js.Object & EventEmitterStatic
       
diff --git a/ts/src/main/scala/org/scalablytyped/converter/internal/ts/modules/DeriveCopy.scala b/ts/src/main/scala/org/scalablytyped/converter/internal/ts/modules/DeriveCopy.scala
index 842855a548..ec6986038a 100644
--- a/ts/src/main/scala/org/scalablytyped/converter/internal/ts/modules/DeriveCopy.scala
+++ b/ts/src/main/scala/org/scalablytyped/converter/internal/ts/modules/DeriveCopy.scala
@@ -37,6 +37,10 @@ object DeriveCopy {
         val name = rename.getOrElse(origName)
 
         val derived = x match {
+          // these are synthetic, and should be re-expanded downstream
+          case _: TsDeclClass if x.comments.has[Marker.ExpandedClass.type] =>
+            IArray.Empty
+
           case x: TsDeclClass =>
             IArray(
               x.copy(