Kotlin remote debugging code via IntelliJ

Question

There is an application written in Java and Kotlin. I run this in debug mode. The debugger connects correctly. If my breakpoint is set in Java code, it hits, but there is no breakpoint in Kotlin code. Why is this? How to make it work in IntelliJ?

Both types of sources are in src / main.

Actually, StackOverflow has the answer to this question. This may be noted as a duplicate of the Intellij IDEA Debugger not working on the Gradle Vert.X project