Invalid schema configuration: True is not a valid type at path createdAt.immutable

[nicecatch]

I updated to Mongoose 6.0.7 and all of my models use timestamps: true

Here an example:

export interface IDocumentProjectRequest extends IProjectRequest, Document {}

const projectRequestSchema = new Schema(
  {
    user: { type: Schema.Types.ObjectId, ref: "users", required: true },
    diagnostic: {
      type: Schema.Types.ObjectId,
      ref: "diagnostic",
      required: true,
    },
    project: { type: Schema.Types.ObjectId, ref: "project" },
  },
  { collection: "projectRequests", timestamps: true }
);

export const ProjectRequest = mongoose.model<IDocumentProjectRequest>(
  "projectRequest",
  projectRequestSchema
);

but when I try to run the project I get this error

TypeError: Invalid schema configuration: `True` is not a valid type at path `createdAt.immutable`. See http://bit.ly/mongoose-schematypes for a list of valid schema types.
    at Schema.interpretAsType (C:\src\server\node_modules\mongoose\lib\schema.js:1019:11)
    at Schema.path (C:\src\server\node_modules\mongoose\lib\schema.js:677:27)
    at Schema.add (C:\src\server\node_modules\mongoose\lib\schema.js:495:12)
    at Schema.add (C:\src\server\node_modules\mongoose\lib\schema.js:506:12)
    at setupTimestamps (C:\src\server\node_modules\mongoose\lib\helpers\timestamps\setupTimestamps.js:36:10)
    at Schema.setupTimestamp (C:\src\server\node_modules\mongoose\lib\schema.js:1221:10)
    at new Schema (C:\src\server\node_modules\mongoose\lib\schema.js:141:8)
    at Object.<anonymous> (C:\src\serverr\src\db\models\Account.ts:7:23)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Module._compile (C:\src\server\node_modules\source-map-support\source-map-support.js:568:25)
[ERROR] 09:09:08 TypeError: Invalid schema configuration: `True` is not a valid type at path `createdAt.immutable`. See http://bit.ly/mongoose-schematypes for a list of valid schema types.

this seems to be linked to this pull request #10267
because when I manually revert
schemaAdditions[createdAt] = { type: Date, immutable: true };
to
schemaAdditions[createdAt] = Date;
it works again

[nicecatch]

Found the problem

We have a model with a custom typeKey option (since one of the fields name is 'type')
The timestamps plugin doesn't respect this parameter and leads to that error
For now we have renamed the 'type' field in the model to a different name