upgrading from 2.3.4 to 2.3.5 I get this error on compilation:

> Task :androidApp:mergeDebugJavaResource FAILED
Execution failed for task ':androidApp:mergeDebugJavaResource'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.MergeJavaResWorkAction
   > 2 files found with path 'META-INF/versions/9/previous-compilation-data.bin'.
     Adding a packagingOptions block may help, please refer to
     <https://developer.android.com/reference/tools/gradle-api/8.1/com/android/build/api/dsl/ResourcesPackagingOptions>
     for more information

is it a bug, or should I add some extra gradle configurations?

This is a bug. You can use a workaround described in this comment.

ok, thanks. I will wait for 2.3.6

This issue isn't fixed yet.