Internal Error on CloudFormation + Batch JobDefinition + Tags

Whenever I try to update tags on an AWS::Batch::JobDefinition, the template deployment fails with "Internal Error". Without changing tags, no problem, with tags, internal error, whatever the tag name or value are.

I'm using the latest AWS CLI

Here is such a template:

MyJobDefinition:
    Type: AWS::Batch::JobDefinition
    Properties:
      Type: "container"
      Parameters: {}
      RetryStrategy:
        Attempts: 2
      PropagateTags: true
      Tags:
        Version: "3.1.1"
      ContainerProperties:
        Command:
          - "python3"
          - "worker.py"
        JobRoleArn:
          Fn::ImportValue: !Sub "${IAMStackName}-EcsTaskExecutionRole"
        Image:
          Fn::Join:
            - ":"
            - - Fn::ImportValue: !Sub "${BaseStackName}-WorkerRepositoryUri"
              - !Ref DockerImageTag
        ResourceRequirements:
          -
            Type: VCPU
            Value: 16
          -
            Type: MEMORY
            Value: 16384

Steps to reproduce:

• 1. Take the example CFN template https://s3-us-east-2.amazonaws.com/cloudformation-templates-us-east-2/Managed_EC2_Batch_Environment.template
• 2. Add a Tag in the JobDefinition (eg. below)
• 3. Deploy. All works
• 4. Change the JobDefinition Tag in the template
• 5. Deploy -> Internal Fail

"JobDefinition" : {
      "Type" : "AWS::Batch::JobDefinition",
      "Properties" : {
        "Type" : "container",
        "ContainerProperties" : {
          "Image" : { 
	    "Fn::Join": [ "", [ "137112412989.dkr.ecr.", { "Ref" : "AWS::Region" }, ".amazonaws.com/amazonlinux:latest" ]] 
	  },
          "Vcpus" : 2,
          "Memory" : 2000,
          "Command" : [ "echo", "Hello world" ]
        },
        "RetryStrategy" : {
          "Attempts" : 1
        },
        "Tags": {
          "svat-version": "3.1.1"
        }
      }
    },