If Replace operation is performed on JSON that doesn't have specified fields, these fields are added to JSON

[anaruzhnii]

Environment

• Nuget Package: JsonPatch.Net
• Nuget Version: 2.0.5
• OS: Windows 11 Pro
• .Net Target: .NET 5, 6, 7

Describe the bug
If Replace operation is performed on JSON that doesn't have specified fields, these fields are added to JSON

To Reproduce

Code to reproduce the problem

using System;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Nodes;
using Json.Patch;
using Json.Pointer;

const string mask = "*****";
var maskJson = JsonValue.Create(mask);

var pathsToPatch = new[] { "/first_name", "/last_name" };

var patchOperations = pathsToPatch.Select(path => PatchOperation.Replace(JsonPointer.Parse(path), maskJson));
var patchConfig = new JsonPatch(patchOperations);

const string singleObjectJson =
    "{\"id\":\"640729d45434f90313d25c78\",\"guid\":\"f2e2767c-03e0-4862-addc-7d46c55efb33\",\"city\":\"Boston\"}";

var singleObject = JsonNode.Parse(singleObjectJson);
var patchedSingleObject = patchConfig.Apply(singleObject).Result;
Console.WriteLine(JsonSerializer.Serialize(patchedSingleObject));
// ^ outputs {"id":"640729d45434f90313d25c78","guid":"f2e2767c-03e0-4862-addc-7d46c55efb33","city":"Boston","first_name":"*****","last_name":"*****"}

Expected behavior
Nothing changes in JSON
Considering that https://jsonpatch.com/ says that Replace equals to Remove and Add, I assume Remove result should be checked before adding the new fields

[gregsdennis]

That's a reasonable check. Have you tested on any other online playgrounds?

[anaruzhnii]

So I've just checked that and found out that the RFC6902 notation explicitly says that The target location MUST exist for the operation to be successful.
I've also tried it out using online tools and JS libraries.
https://jsonpatch.me/ silently returns unmodified JSON.
Both jsonpatch.js and jsonpatch-js throw an error about missing value.