On fields if `pattern` parameter is added swagger execute request button when clicked has no effect

[ClimenteA]

Here is the minimum code required to replay the error:

from flask import Flask, request
from flask_restx import Resource, Api, fields

app = Flask(__name__)
api = Api(app)

simple_email_model = api.model("email_model", dict(
    email=fields.String(required=True, pattern=".+@.+")
))

@api.route('/email')
class TestEmail(Resource):

    @api.expect(simple_email_model, validate=True)
    def post(self):
        return request.json

if __name__ == '__main__':
    app.run(debug=True)

I expect if pattern doesn't match the validation should fail.

But, when I go to swagger-ui, complete the field and click on Execute button - nothing happens (the request is not made, button is freezed).

Environment

• Python version - 3.8
• Flask version - 2.0.3
• Flask-RESTX version - 0.5.1