Graph preview doesn't work after setting Role for lambda

[tech-meppem]

The graph preview is failing to display, as soon as I set the Role Property on the Lambda Function.

IAM Role resource

  IAMRoleLambdaRawFile:
    Type: AWS::IAM::Role
    Properties:
      Path: /
      RoleName: !Join
        - "-"
        - [ !Ref "AWS::Region", !Ref "AWS::StackName", "lambda-raw-file-role" ]
      AssumeRolePolicyDocument:
        Statement:
        - Effect: Allow
          Principal:
            Service:
            - lambda.amazonaws.com
          Action:
          - 'sts:AssumeRole'
      Policies:
      - PolicyName: "root"
        PolicyDocument:
          Version: "2012-10-17"
          Statement:
          - Effect: "Allow"
            Action:
            - 's3:*'
            - 's3-object-lambda:*'
            - "dynamodb:*"
            - "iot:*"
            Resource: "*"

Lambda Function resource

  LambdaSetupFileUpload:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName:
        Ref: SetupFileUploadLambdaName
      Handler: lambda_function.lambda_handler
      Runtime: python3.12
      Role: !GetAtt IAMRoleLambdaRawFile.Arn
      Code:
        S3Bucket: init-file-upload
        S3Key: Bundle_FileUpload.zip

Commenting out or removing the "Role" in lambda function successfully makes a graph.

Same thing happens when adding a "DependsOn", so I'm guessing it's something to do with the connections?

extension version: 0.26.1

VSCode About Me

Version: 1.96.4 (system setup)
Commit: cd4ee3b1c348a13bafd8f9ad8060705f6d4b9cba
Date: 2025-01-16T00:16:19.038Z
Electron: 32.2.6
ElectronBuildId: 10629634
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Windows_NT x64 10.0.19045

Python 3.8

Python pip package details

Name: cfn-lint
Version: 1.22.5
Summary: Checks CloudFormation templates for practices and behaviour that could potentially be improved
Home-page: https://github.com/aws-cloudformation/cfn-lint
Author: Kevin DeJong
Author-email: kddejong@amazon.com
License: MIT no attribution
Location: /home/netduma/.local/lib/python3.8/site-packages
Requires: aws-sam-translator, jsonpatch, networkx, pyyaml, regex, sympy, typing_extensions
Required-by:

Name: pydot
Version: 3.0.4
Summary: Python interface to Graphviz's Dot
Home-page: https://github.com/pydot/pydot
Author:
Author-email: Ero Carrera ero.carrera@gmail.com, Peter Nowee peter@peternowee.com, Łukasz lukaszlapinski7@gmail.com, "FeRD (Frank Dana)" ferdnyc@gmail.com
License: MIT
Location: /home/netduma/.local/lib/python3.8/site-packages
Requires: pyparsing
Required-by:

Edit:
Updating to python 3.12 hasn't helped.