patternProperties not working

[phhoef]

Hi,

I am trying to validate a quite simple schema, but I've problems and probably it's related to my setup.
I am using Svelte 5 in a Wails3 project.

This is my CodeMirror instance in a component.

<CodeMirror
  value={mapping}
  on:change={onChange}
  class="flex-1 w-full"
  lineWrapping
  theme={$mode === "dark" ? oneDark : undefined}
  extensions={[
    jsonSchema(schema),
  ]}
/>

And this is my schema definition:

export const schema: JSONSchema7 = {
    type: "object",
    patternProperties: {
      "^[1-9]\d*$": {
        type: "array",
        items: {
          type: "object",
          properties: {
            doc: { type: "integer", minimum: 1 },
            after: { type: "integer", minimum: 1 },
            blank: { type: "boolean" }
          },
          required: ["doc"],
          additionalProperties: false
        }
      }
    },
    additionalProperties: false
  };

I do not get any errors.

The properties must be numbers starting from 1.
Can please someone give me some guidance?