Rest call to splunk licenser/localslave to get master_uri returns "self"

[shoof]

Hello,

We have an integration test which verifies expected values after deploying a new splunk instance. This test is written in python using the requests module.

We're using port forwarding to reach the deployed splunk instance, the url we're hitting is:
f"https://localhost:arbitrary_port/services/licenser/localslave?output_mode=json"

From the output we're using the following keys to get the master_uri value:
['entry'][0]['content']['master_uri']

This test often passes, but sometimes will fail because the value returned is "self".

Any idea why this would be happening?

[shoof]

Apparently this started happening with Splunk 8, but is not an issue with Splunk 7.3.