Has anyone ever encountered an error like this? `...

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[tschuchort]

Has anyone ever encountered an error like this?
java.lang.VerifyError: Verifier rejected class com.tschuchort.readerforcommitstrip.zoom.ZoomPresenter due to bad method io.reactivex.Observable com.tschuchort.readerforcommitstrip.zoom.ZoomPresenter.update() (declaration of 'com.tschuchort.readerforcommitstrip.zoom.ZoomPresenter' appears in /data/app/com.tschuchort.readerforcommitstrip-2/split_lib_slice_4_apk.apk)

I'm really lost here. I've tried clean build, invalidate caches and restart, deinstalling the app, deleting the build folder, disabling instant run... nothing helped.

The method in question looks like this: override fun update(): Observable<ProgramUpdate> = Observable.mergeArray( /*...*/) Interestingly it works when I use Observable.never() instead. Doesn't matter what I pass as the argument to mergeArray