Generated code for case class with Map field has default value incorrect

[cuongdd2]

I see a bug when serialize to case class A(fields: Map[String, Int] = Map())
Generated code becomes: private[this] val c0: scala.collection.immutable.Map[String,Int] = Map.empty[String];
without default value, it's fine
The bug due to this line of code:

genReadMap(q"var x = ${withNullValueFor(tpe)(q"${collectionCompanion(tpe)}.empty[$tpe1]")}",
            q"x = x.updated(in.readKeyAsLong(), ${genReadVal(tpe1, nullValue(tpe1), isStringified)})")

collectionCompanion(tpe)}.empty[$tpe1] should be collectionCompanion(tpe)}.empty[$tpe1,$tpe2]