The JetBrains trove4j fork is a transitive dependency:

org.jetbrains.intellij.deps:trove4j:jar:1.0.20181211:runtime

This complicates installation of the Kotlin scripting engine into Fiji.app/jars as the existing trove4j jar has a higher major version and takes precedence. Deleting the existing trove4j jar breaks Fiji in other places. I decided to rename the JetBrains trove4j jar and copy it into the Fiji.app/jars directory manually. There may be unintended side effects but it works for my use case of getting Kotlin scripting to work in IntelliJ.