Reproducer for issue with Crashlytics and Kotlin DSL The issue was originally described here, along with a workaround.
To verify that this works as expected with the Groovy DSL, checkout commit with ID c3d3c5b, run ./gradlew assembleDebug && ./gradlew assembleDebug, and observe the output:
27 actionable tasks: 27 up-to-date
which indicates every task was up to date and none had to re-run.
To verify the issue with the Kotlin DSL, checkout master (or commit ID 00a532c) and do the same thing. Observe the output
27 actionable tasks: 4 executed, 23 up-to-date
which indicates 4 tasks were re-run. You may furthermore navigate to the build scan and observe that the :app:fabricGenerateResourcesDebug task re-ran.