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tldr: remove `alias(libs.plugins.kotlin.jvm)` from `buildSrc/build.gradle.kts`’s plugins block.

The `kotlin-dsl` plugin already applies the Kotlin plugin that’s embedded into Gradle. Applying the Kotlin plugin twice is probably going to be okay, but it might cause weird issues. So only apply `kotlin-dsl`.

you’ve mixed kotlin-dsl and kotlin-jvm plugins:
```alias(libs.plugins.kotlin.jvm)
    `kotlin-dsl````
That should never be the case.  `kotlin-dsl` is for building a gradle plugin (in Kotlin), `kotlin-jvm` is for your application code.

see <https://docs.gradle.org/current/userguide/kotlin_dsl.html#sec:kotlin-dsl_plugin|the Kotlin DSL plugin docs>

and these issues about the warning:

• <https://github.com/gradle/gradle/issues/16779>
• <https://github.com/gradle/gradle/issues/13020>
• <https://github.com/gradle/gradle/issues/20132>
• <https://github.com/gradle/gradle/issues/22647>


So I have removd `alias(libs.plugins.kotlin.jvm)`  from `build.gradle.kts` `plugins` block, but the warning is still there. After removing it from dependencies block my build fails as some of the custom conventions plugins are depending on `org.jetbrains.kotlin.jvm`

```&gt; Task :buildSrc:generatePrecompiledScriptPluginAccessors FAILED
4 actionable tasks: 3 executed, 1 up-to-date

FAILURE: Build failed with an exception.

* Where:
Precompiled script plugin '/Users/igorwojda/IdeaProjects/mango/buildSrc/src/main/kotlin/local.base.gradle.kts' line: 1

* What went wrong:
Plugin [id: 'org.jetbrains.kotlin.jvm'] was not found in any of the following sources:```


possibly applying this plugin `alias(libs.plugins.kotlin.plugin.jpa)` in buildSrc might also bring along the Kotlin JVM plugin

in fact, I think you can probably remove all plugins except for `kotlin-dsl` and the code-analysis plugins

```// buildSrc/build.gradle.kts

plugins {
    `kotlin-dsl`

    alias(libs.plugins.spotless)
    alias(libs.plugins.detekt)
}```

it’s possible the issue is wider-spread than just buildSrc/build.gradle.kts  - if there are precompiled script plugins that, by themselves or in conjunction with other plugins applied, also apply that combination of plugins `kotlin-dsl` and `kotlin("jvm")` .  Your buildSrc stuff should solely use `kotlin-dsl`.  Unless your convention plugins and the projects using them are also building plugins they should likely use `kotlin("jvm")`

Good tips I have cleaned up rest of the plugins and updated config.
Thx everyone for help