From the discussion in the PR https://github.com/DSpace/DSpace/pull/1929
Tom Desair We might want to move the conversion from a JSON request body to a Patch object to a custom HandlerMethodArgumentResolver (like we did with the SearchFilterResolver) so that Spring can directly inject Patch objects as a method parameter. But this can be postponed to another ticket.
Luigi Andrea Pascarelli (4Science) Yes, it is better to postpone that. Honestly I'm not sure if the JSON Patch will be the only standard to support in DSpace 7.x (JSON Merge Patch is the other standard), so probably the best choice is to postpone