NoClassDefFoundError's after update to gradle-plugin v8.5.1

after update from gradle-plugin v8.5.0 to v8.5.1, I get errors for Kotlin files which don't contain any Kotlin classes.

Log output is:
```
...
.../MediaTypes.kt:LINE_UNDEFINED ktlint(java.lang.NoClassDefFoundError) com/pinterest/ktlint/rule/engine/api/EditorConfigDefaults (...)
...
```

The example file MediaTypes.kt has this content:

```
package xyz

const val MEDIA_TYPE_WORD = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
```