cfn-lint incorrectly issues E1011 (FindInMap validation of configuration) with !Sub referencing AWS::AccountId

[Slooz]

CloudFormation Lint Version

1.20.1

What operating system are you using?

Mac

Describe the bug

cfn-lint incorrectly issues E1011 (FindInMap validation of configuration) with !Sub referencing AWS::AccountId.

$ cfn-lint --format pretty --regions us-east-2 --include-checks I --configure-rule E3012:strict=True I3042:region=True I3042:accountId=True -- template.yaml

template.yaml
16:11:              E1011     '123456789012AccountBucketName' is not one of ['234567890123AccountBucketName'] for mapping 'BucketMap' and key 'BucketGroup'

Cfn-lint scanned 1 templates against 234 rules and found 1 errors, 0 warnings, and 0 informational violations

Expected behavior

E1011 is not issued for the reproduction template

Reproduction template

%YAML 1.2
---
AWSTemplateFormatVersion: 2010-09-09
Mappings:
  BucketMap:
    BucketGroup:
      234567890123AccountBucketName: Bucket
Transform: AWS::LanguageExtensions
Resources:
  Resource:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !FindInMap
        - BucketMap
        - BucketGroup
        - !Sub ${AWS::AccountId}AccountBucketName