Dotty deviation in either implicit search or java wildcards

[DarkDimius]

???.getClass.getMethods.head.getParameterTypes.mkString(",")

compiles fine with scalac. Does not in Dotty:

error: type mismatch:
 found   : Array[Class[_]]
 required: ?{ mkString: ? }
Note that implicit conversions cannot be applied because they are ambiguous;
 both method wrapRefArray in class LowPriorityImplicits and method genericArrayOps in object Predef$ convert from Array[Class[_]] to ?{ mkString: FunProto(","):? }
    val baz_int_param = ???.getClass.getMethods.head.getParameterTypes.mkString(",")

This is part of test cases of #630, so it used to compile fine back then.

[smarter]

Note that the following works as expected:

 val x = ???.getClass.getMethods.head.getParameterTypes
 x.mkString(",")