Rxjava tolist() not completing

I have a problem with my RxJava callchain. The toList is not working properly. I would guess that it is that the toList() needs something to complete. That is why it is stuck. But i do not know how to solve this issue

The code

        mModel.getLocations()
            .flatMapIterable(new Function<List<Location>, List<Location>>(){
                @Override
                public List<Location> apply(final List<Location> locations) throws Exception {
                    return locations;
                }
            })
            .filter(new Predicate<Location>() {
                @Override
                public boolean test(final Location location) throws Exception {
                    return location.searchExistInNameOrKeyWord(input);
                }
            })
            .toList()
            .map(new Function<List<Location>, List<Location>>() {
                @Override
                public List<Location> apply(List<Location> locations) throws Exception {                     
                    /** Doing some random work with the list and then returning */
                }
            })
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Consumer<List<Location>>() {
                @Override
                public void accept(final List<Location> locations) throws Exception {
                    mView.setAdapterItems(locations);
                }
            });

Maybe someone that is a lot better than me at RxJava could pinpoint what i am doing wrong.

Update

@Query("SELECT * from location")
Flowable<List<Location>> loadAllLocations();

The mModel.getLocations() just calls the loadAllLocations like above from the Room percistance storage