There have been many issues reported regarding json patch still being tied to Newtonsoft.Json deserialization. The issues are caused by adverse effects of the association, or directly indicating dissatisfaction with it:
#12994
#13938
#14035
#16968
#22216
#22620

System.Text.Json has merits over Newtonsoft.Json purported by Microsoft with indication to fully remove the Json.NET dependency from ASP.NET Core.

Thus, we want to remove the Json.NET dependency from ASP.NET Core 3.0, so that customers can choose which version to use, without fearing they might accidentally break the underlying platform.

Configuration of json patch to only use Newtonsoft.Json processing for patch requests is contrived, requiring building an entire separate service collection with complete MVC to pull an input formatter with appropriate DI.

To indicate the intent of complete System.Text.Json support in ASP.NET Core, not have the support, and then to consistently delay in the face of consistent issues is extremely discouraging:
#12994 (comment)
#14035 (comment)
#14035 (comment)
#16968 (comment)

JsonPatchDocument should use System.Text.Json #24333

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