Default Getting base64 encrypted KMS key value - version 5.1.2

[swapnilgangrade01]

I am getting bs64 encrypted data even when I am using [plain] explicitly in application.yml.

Input -
secretKey: '{cipher}[output=plain]AQICAHgIQjiUCcEmiMlQkpKpQm9t6LVNLprl4kMCtLSOzmhW0wEiJ4yCAocdNg7/Le7BPvdAAAAAqzCBqAYJKoZIhvcNAQcGoIGaMIGXAgEAMIGRBgkqhkiG9w0BBwEwHgYJYIZIAWUDBAEuMBEEDFzlVJm3QRa5UVy9MQIBEIBkYkARHFeY+/l7MFbN2NfVwwIpuQoMHNAp+FruHPwBU6G8tK9OCLbo7TR0+3XrfQayxnHK447kQmRLJ+AyQHEm6VmHeAx+k9YgNk+eTLPCbPW8U5I+csZoDmFYrf9FLzJW0BKW0w=='

output -
49ef6c32-cc8c-409c-aeb0-0392f405802b:c7bfc9c4-8a64-44e5-b2fa-fec172ad4da9

pom.xml details

<java.version>1.8</java.version>
<spring-cloud.version>Hoxton.SR5</spring-cloud.version>
<aws-java-sdk.version>1.11.774</aws-java-sdk.version>
<spring-cloud-config-aws-kms.version>5.1.2</spring-cloud-config-aws-kms.version>

Compared with AWS command line cli decrypt the key with output as bs64 I am getting the same output as the application is giving.
Command -
aws kms decrypt --ciphertext-blob fileb:///tmp/cipherblob --output text --query Plaintext | base64 -d

49ef6c32-cc8c-409c-aeb0-0392f405802b:c7bfc9c4-8a64-44e5-b2fa-fec172ad4da9