Java-first annotations disappear when same property comes from multiple superclass sources on KSP2

[luanpotter]

We are currently in the process of migrating our codebase from KSP1 to KSP2 (we are updating to Kotlin 2.2.20 + KSP 2.2.20-2.0.4).

I've noticed a behavioural difference on KSP2 w.r.t. to how getAllProperties() handles annotations coming from multiple sources from inherited properties.

I wrote a simple MRE to showcase the issue; but in essence we have:

interface HasName {
    val name: String
}

abstract class BaseEntity {
    @Column(name = "name") lateinit var name: String
}

@InspectProperties
class WithInterface : BaseEntity(), HasName

Before (with KSP1), the annotations in the properties returned by getAllProperties() would include the @Column interface as I'd expect. On KSP2, it is no longer included. As far as I can tell, this only happens if:

• @Column is defined as a Java interface
• the class inherits from two sources (an abstract class and an interface) that both declare the same column

Feel free to browse the complete MRE on my repo; there is a ./scripts/run.sh script to make it easier to see and play around with.