What is the safest way to edit the swiftui String Catalog file directly?

It appears that a comment in my string catalog file causes Xcode to crash when it is rendered in the Source Control Navigator View (yes - it did drive me crazy)

The string is: "X" : { "comment" : "Represents doubled in header\nfrom contract struct",

which was derived from this source code: return String(localized: "X", comment: "Represents doubled in the header")

I suspect the carriage return in the comment is the problem, but I can't remove it. Clearly, this comment is legacy and no longer matches the swiftui source code, but it won't update so my Xcode crashes when trying to submit.

How can I change this comment in the String catalogue?

I tried editing the json file directly but this is ignored. I tried removing the code line and then reading it but the offending comment returns to the string catalog so I guess it's cached somewhere. I tried cleaning the build folder and repeating the above steps - no success, the comment remains and Xcode crashes.

Can I simply drag and drop a duplicate of the string catalog into my project (with the comment corrected) or will that mess up the project?

Version 15.4 (15F31d) on MacBook Air

I tried editing the json file directly but this is ignored.

That sounds like the localisation key is still managed automatically by Xcode. I would try switching to manual management first, so that Xcode doesn't update it automatically on every build.

In string catalog view, select "Manual" here

Or in JSON:

{
  "sourceLanguage" : "en",
  "strings" : {
    "Foo" : {
      "comment" : "Some Comment",
      "extractionState" : "manual", // <----
      "localizations" : {
        ...
      }
    }
  },
  "version" : "1.0"
}