Map.merge doesn't work with nested maps [Resolved]

It’s a single instance that I’m using for developments, but nevertheless I would expect that the reducer sees the same amount of data as the mapper.

The result that I’m getting matches the four results I do see in the reducer, hence I assume that the other data is lost somehow.

I did provide data and sample code for you to reproduce the issue and shared it with you via Dropbox, here again:

You can use the data of the other example that I prepared for you for my other issue Commonly used library of functions:

Thanks