Diff filter doesn't work on object arrays?

[Screen Recording 2022-09-21 at 14.07.26.mov]I have two JSON arrays, and I'm trying to use the diff function to identify unique objects in the array.

This works fine on a simple array of numbers, but on an array of objects, it says 'an unknown error has occurred'

Please see the video attached. First I show you that both datasets are formatted the same. Secondly, I activate the 'diff' filter and the error occurs.

Any help would be appreciated thanks!