Android Studio 3.1 Canary 8 is now available in the Canary and Dev channels, and includes general bug fixes.
For example, this release fixes an issue that broke Kotlin annotation processors for projects that enabled Data Binding. (See issue #70915745)
If you already have an Android Studio build on the Canary or Dev channel, you can get the update by clicking Help > Check for Update (or Android Studio > Check for Updates on Mac). Otherwise, you can download here.