Originally reported in https://github.com/localstack/localstack/issues/2099, the CreationTime for CF stacks was hardcoded. This was fixed in in LocalStack itself (https://github.com/localstack/localstack/pull/2103), but is now also fixed in moto (https://github.com/spulec/moto/pull/2818).

I don't know what version of moto you're using, and whether it's acceptable to use dev-releases, but if you do: 

moto 1.3.15.dev550 should fix this issue, so the LS fix can be removed if you upgrade :) 
},
    'Lambda::Function': {
        'create': {
            'function': 'create_function',
            'parameters': {
                'FunctionName': 'FunctionName',
                'Runtime': 'Runtime',
                'Role': 'Role',
                'Handler': 'Handler',
                'Code': get_lambda_code_param,
                'Description': 'Description',
                'Environment': 'Environment',
                'Timeout': 'Timeout',
                'MemorySize': 'MemorySize',
                
            },
            'defaults': {
                'Role': 'test_role'
            }
        }
    },
    'Lambda::Version': {
        'create': {
            'function': 'publish_version',
            'parameters': {
                'FunctionName': 'FunctionName',
                'CodeSha256': 'CodeSha256',
                'Description': 'Description'
            }