Confusing project layout for combined java/kotlin gradle project

### Apache NetBeans version

Apache NetBeans latest daily build

### What happened

I work on combined java/kotlin gradle project so I have separated source folders for java and kotlin files.
But in opened in IDE project I see next source nodes: Source Packages (where java files lies), Source Packages [kotlin][main] (where I see kotlin files) and last one Source Packages [kotlin][java]
And under last node I see java files again. That is unexpected

### Language / Project Type / NetBeans Component

combined java/kotlin gradle project

### How to reproduce

Open gradle project both with java and kotlin plugins connected

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Ubuntu Linux

### JDK

Java: 17.0.10; OpenJDK 64-Bit

### Apache NetBeans packaging

Own source build

### Anything else

_No response_

### Are you willing to submit a pull request?

No

Reproduce the issue by opening a combined Java/Kotlin Gradle project with both plugins enabled on Ubuntu. Inspect how the IDE builds the Source Packages nodes; done means Java files are not shown again under Source Packages [kotlin][java].

Written by the indexing model from the issue text.