The creator of Scala disagrees: https://youtu.be/Xn_YpUtXWT4?t=850
And as far as I'm aware, both kotlin and Scala don't really suffer due to type erasure.
That being said, it is easier to write a language on top of the JVM with good interop, since there are less ways to implement features. Essentially, your language has to interop with Java.
And it is harder to have good interop between CLR languages because there are more ways to implement features. Essentially, your language has to interop with C#.