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I want to merge two Completable -s but there is no final onComplete call.

This is my code:

private fun dataLoading(): Completable {
    return Completable.merge(listOf(
            method1(),
            method2()))
            .doOnComplete {
                // not called
private fun method1(): Completable {
    return merge(loadHistory(),
            loadData(),
            loadFavorites(),
            loadBalance())
            .doOnComplete {
                // called
private fun method2(): Completable {
    return Single
            .fromFuture(locationSubject.toFuture()) // BehaviorSubject
            .timeout(1, TimeUnit.SECONDS) // waiting for coordinates 1 sec
            .flatMapCompletable { onLocationLoaded(it) } // not called
            .onErrorComplete() // got TimeoutException here
            .doOnComplete {
                // called
How to fix it?
                Why are you trying to convert between Single and Subject via to/fromFuture? toFuture requires the source to complete. Use locationSubject.firstOrError().timeout().flatMapCompletable... instead.
– akarnokd
                Sep 3, 2018 at 15:57
toFuture requires the source to complete. Use something like this:
private fun method2(): Completable {
    return locationSubject  // BehaviorSubject
        .firstOrError() // <---------------------------------------------- Single
        .timeout(1, TimeUnit.SECONDS) // waiting for coordinates 1 sec
        .flatMapCompletable { onLocationLoaded(it) } // not called
        .onErrorComplete() // got TimeoutException here
        .doOnComplete {
            // called
        
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