E2015 incorrectly raised when type is List<String> and multiple values provided in Default

[verbitan]

CloudFormation Lint Version

cfn-lint 1.5.0

What operating system are you using?

RHEL 8.9

Describe the bug

I have a CloudFormation parameter of type List<String> with an AllowedPattern and Default set.

cfn-lint validates a single default value correctly, but incorrectly raises E2015: Default should be allowed by AllowedPattern when a list of default values is provided.

Expected behavior

CloudFormation itself accepts this default, so cfn-lint should also.

Reproduction template

AWSTemplateFormatVersion: "2010-09-09"

Parameters:
  ListOfCIDR:
    Description: List of CIDR.
    Type: List<String>
    Default: 80.0.0.0/0, 81.0.0.0/8, 82.0.0.0/16
    AllowedPattern: ^([0-9]{1,3}\.){3}[0-9]{1,3}(\/([0-9]|[1-2][0-9]|3[0-2]))?$