Connection reset error when MLE response is enabled in createPayment Call

Start with samples/MLEFeature/PaymentsWithMLE.java and reproduce using request-and-response MLE, then trace the failing call through Api.PaymentsApi.createPayment and Invokers.ApiClient.execute. Check how response MLE is configured and whether the Payments API supports it; done means the payment call completes with response MLE enabled or the supported behavior and required configuration are clearly documented.

Description

While verifying Message Level Encryption (MLE) integration using this SDK together with the official sample repo cybersource-rest-samples-java, I encountered a Connection reset exception only when MLE response encryption is enabled.
The same sample works fine when:

MLE is enabled for request only, or
MLE is disabled entirely.

Enabling both request and response MLE consistently results in a socket connection reset during the payment API (pts/v2/payments) call.

Environment

SDK: This repository (latest which is version 0.087 at this moment)
Samples repo: https://github.com/CyberSource/cybersource-rest-samples-java (latest that uses this SDK ver 0.087)
Sample used: samples/MLEFeature/PaymentsWithMLE.java
Java version: Java 8
OS: Linux

Steps to Reproduce

Clone the sample repository:
git clone https://github.com/CyberSource/cybersource-rest-samples-java

Open the sample:
samples/MLEFeature/PaymentsWithMLE.java

Modify the merchant configuration to enable request and response MLE:
Change (around line #84):
merchantProp = ConfigurationWithMLE.getMerchantDetailsWithMLE1();
To:
merchantProp = ConfigurationWithMLE.getMerchantDetailsWithRequestAndResponseMLE1();

Run:
PaymentsWithMLE.java

Expected Behavior

The payment request should complete successfully when MLE response encryption is enabled, just as it does when only request MLE is enabled.

Actual Behavior

The request fails with a Connection reset error:

Invokers.ApiException: java.net.SocketException: Connection reset
	at Invokers.ApiClient.execute(ApiClient.java:1117)
	at Api.PaymentsApi.createPaymentWithHttpInfo(PaymentsApi.java:348)
	at Api.PaymentsApi.createPayment(PaymentsApi.java:331)
	at samples.MLEFeature.PaymentsWithMLE.run(PaymentsWithMLE.java:90)
	at samples.MLEFeature.PaymentsWithMLE.main(PaymentsWithMLE.java:34)
Caused by: java.net.SocketException: Connection reset
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:318)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:346)

Additional Notes

The failure happens only when response MLE is enabled.
The same credentials and configuration work correctly when response MLE is disabled.
This appears to occur before a valid HTTP response is received (connection reset at socket level).

Questions / Help Requested

Is response MLE currently supported for the Payments API in this SDK?
Are there additional configuration steps required for enabling response MLE?
Is this a known issue or regression?