JSON parsing fails for v8 versions 11.7.72 and newer

[egfx-notifications]

What version of Ajv are you using? Does the issue happen if you use the latest version?
v8.12.0

Ajv options object
not used

JSON Schema

{
  "properties": {
    "test": { "type": "uint8" }
  },
  "additionalProperties": true
}

Sample data

{
      "test": 1,
      "error": "now"
}

Your code

const Ajv = require("ajv/dist/jtd");

const JTDschema = {
  properties: {
    test: { type: "uint8" },
  },
  additionalProperties: true,
};

const payload = `{
        "test": 1,
        "error": "now"
  }`;

const ajv = new Ajv();

const parser = ajv.compileParser(JTDschema);

const output = parser(payload);

if (!output) {
  console.log(parser.position);
  console.log(parser.message);
}

Console output

47
unexpected end

What results did you expect?
Validates successfully, no console output

Are you going to resolve the issue?
Yes, patch is already written, PR incoming

Additional context
v8 11.7.72 changed the message templates for JSON parsing related error messages (https://chromium-review.googlesource.com/c/v8/v8/+/4652014)
This breaks parseJson() and leads to parsing errors if utilizing additionalProperties in a JSONTypeDefinition (other issues not specifically tested).
npm test also produces several errors with the mentioned v8 version.
This can be tested with NodeJS v21.0.0 or newer and deno v1.36.1 or newer since those versions updated their respective v8 versions past the affected version

[epoberezkin]

Needs to be fixed once confirmed