Jmeter override in user.properties not being honored
We have been running various Jmeter load tests on the Azure Load Testing service, automated using Azure Pipelines, using a user.properties file for a "jmeter.save.saveservice.subresults=false" override, for some time now and without issue. Since 04/25, this override has stopped taking effect and metrics are aggregating by subtest instead of transaction controller.
The test scripts, Jmeter test and user.properties file are managed in Azure Repos and were not modified in any capacity around the date this behavior started. The Load Testing extension used for the pipeline task (AzureLoadTest@1) was last updated 04/04, which does not fit the timeline either.
Pipeline logs indicate "Uploaded user properties file for the test successfully" and I confirm its presence from the Azure Load Testing dashboard, when downloading the inputs on a particular test, but the results themselves show that this configuration is not being honored.
What could cause this to stop working, when it has previously been without issue?