SubDocuments Validation is not working on findOneAndUpdate

This is My Model Schema:
````
const BalanceSchema = new Schema({
name: { type: String, required: true },
rate: { type: Number, required: true },
amount: { type: Number, required: true },
});

const InvoiceSchema = new Schema({
key: { type: String, required: true, match: /(EST|INV|BIL)-\w+/ },
name: { type: String, required: true },
taxes: [BalanceSchema]
});
And This How I Update my documents:

Invoice.findOneAndUpdate({
_id: request.params.invoiceId,
}, { status: request.body }, { new: true, runValidators: true }).exec(function (error, invoice) {
if (error) response.apiError(error);
if (!invoice) return response.apiNotFound();
return response.apiResponse(invoice);
});
````
The problem is when I execute this function (findOnAndUpdate), the option runValidators: true doesn't work on taxes subDocuments but only on invoice fields??!!!

The issue provides BalanceSchema, InvoiceSchema, and the findOneAndUpdate call but names no repository files or tests. Reproduce the update with missing or invalid taxes subdocument fields, then inspect the existing validation tests and update-validator behavior. Done means the expected validators run consistently for taxes subdocuments during findOneAndUpdate, with regression coverage.

Written by the indexing model from the issue text.