Regression in gradle/6.23.0. Unable to configre ktlint

[AntsyLich]

summary of problem

spotless {
    kotlin { 
        ktlint()
    }
}

Having the simple block below highlights ktlint(). Hovering on it shows the message "Type BaseKotlinExtension.KtlintConfig! is inaccessible in this context due to: public open inner class KtlintConfig defined in com.diffplug.gradle.spotless.BaseKotlinExtension". But spotless works fine. Now if i try to access any method of ktlint config like below red squiggly line appers below that method and hovering over them shows the message "Cannot access 'BaseKotlinExtension': it is package-private in 'com.diffplug.gradle.spotless'"

spotless {
    kotlin {
        ktlint()
            .customRuleSets(listOf("io.nlopez.compose.rules:ktlint:0.3.3"))
    }
}

Gradle or Maven version

Gradle 8.4

spotless version

gradle/6.23.0

operating system and version

Windows 11

copy-paste your full Spotless configuration block(s), and a link to a public git repo that reproduces the problem if possible

See above

copy-paste the full content of any console errors emitted by gradlew spotless[Apply/Check] --stacktrace

> Configure project :app
w: file:///D:/[...]/android/app/build.gradle.kts:46:9: Type BaseKotlinExtension.KtlintConfig! is inaccessible in this context due to: public open inner class KtlintConfig defined in com.diffplug.gradle.spotless.BaseKotlinExtension
w: file:///D:/[...]/android/app/build.gradle.kts:46:9: Type BaseKotlinExtension.KtlintConfig! is inaccessible in this context due to: public open inner class KtlintConfig defined in com.diffplug.gradle.spotless.BaseKotlinExtension
e: file:///D:/[...]/android/app/build.gradle.kts:47:14: Cannot access 'BaseKotlinExtension': it is package-private in 'com.diffplug.gradle.spotless'

FAILURE: Build failed with an exception.

* Where:
Build file 'D:\[...]\android\app\build.gradle.kts' line: 47

* What went wrong:
Script compilation error:

  Line 47:             .customRuleSets(listOf("io.nlopez.compose.rules:ktlint:0.3.3"))
                        ^ Cannot access 'BaseKotlinExtension': it is package-private in 'com.diffplug.gradle.spotless'

If you're just submitting a feature request or question, no need for the above.

[Goooler]

Fixing this in #1912.

[TWiStErRob]

See also gradle-nexus/publish-plugin#286, same issue.

[StefanLobbenmeierObjego]

ktfmt is affected by the same issue, adding this here in case someone searches for that instead:

* What went wrong:
Script compilation error:

  Line 141:     kotlinGradle { ktfmt().dropboxStyle() }
                                       ^ Cannot access 'BaseKotlinExtension': it is package-private in 'com.diffplug.gradle.spotless'

1 error