Type Merging batching

[KumarKodali]

Hello -
I am trying to use Type merging between 2 different sources and especially the batch n+1 setup. Its working great so far except that I am getting an issue when the 2nd service sends its results back in a different order than requested. Here is the link to my code sandbox which shows the issue.
Its basically the same sandbox from the documentation with just one change to authors resolver where I am just reversing the input ids array.

Thank you for your time and Any help would be greatly appreciated.