Kernel references leaked into script classpath

[nikitinas]

%use klaxon(2.1.8)
class Person (val name: String, var age: Int = 23)
val klaxon = Klaxon()
klaxon.parse<Person>("""
    {
      "name": "John Smith"
    }
    """)

Fails with runtime error, because script is compiled with kernel's klaxon 5.2, but is evaluated with imported klaxon 2.1.8.