diff --git a/compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala b/compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala
index 7b80c7c80a21..cf9885d16d1f 100644
--- a/compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala
+++ b/compiler/src/dotty/tools/dotc/core/tasty/TreePickler.scala
@@ -861,7 +861,7 @@ class TreePickler(pickler: TastyPickler, attributes: Attributes) {
       assert(isModifierTag(tag))
       writeByte(tag)
     }
-    assert(!flags.is(Scala2x))
+    if flags.is(Scala2x) then assert(attributes.scala2StandardLibrary)
     if (flags.is(Private)) writeModTag(PRIVATE)
     if (flags.is(Protected)) writeModTag(PROTECTED)
     if (flags.is(Final, butNot = Module)) writeModTag(FINAL)
diff --git a/project/Scala2LibraryBootstrappedMiMaFilters.scala b/project/Scala2LibraryBootstrappedMiMaFilters.scala
index d93f67c8291c..70070fddf3e2 100644
--- a/project/Scala2LibraryBootstrappedMiMaFilters.scala
+++ b/project/Scala2LibraryBootstrappedMiMaFilters.scala
@@ -66,8 +66,6 @@ object Scala2LibraryBootstrappedMiMaFilters {
         ProblemFilters.exclude[FinalMethodProblem]("scala.io.Source.NoPositioner"),
         ProblemFilters.exclude[FinalMethodProblem]("scala.io.Source.RelaxedPosition"),
         ProblemFilters.exclude[FinalMethodProblem]("scala.io.Source.RelaxedPositioner"),
-        ProblemFilters.exclude[IncompatibleResultTypeProblem]("scala.reflect.ManifestFactory#NothingManifest.newArray"),
-        ProblemFilters.exclude[IncompatibleResultTypeProblem]("scala.reflect.ManifestFactory#NullManifest.newArray"),
         ProblemFilters.exclude[MissingFieldProblem]("scala.collection.ArrayOps#ReverseIterator.xs"),
         ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.NonLocalReturnControl.value"),
       ) ++