STC: extension method cannot provide map property (read mode)

Consider the following:

@TypeChecked
void test() {
  def map = [:]
  print map.metaClass
}
test()

The script prints "null" (before Groovy 5) indicating that "getMetaClass()" extension method is not used. However, node metadata indicates that the extension method is used. For example, adding "Number n = map.metaClass" says: "Cannot assign value of type groovy.lang.MetaClass to variable of type java.lang.Number"

GROOVY-5001, GROOVY-5491, GROOVY-5568, GROOVY-9115, GROOVY-9123