Adding SSH base url parameters in bitbucket.properties doesn't set the base url

Issue Summary

Trying to set SSH Base URL with these two parameters:
plugin.ssh.baseurl=
plugin.ssh.port=
has no effect on the SSH baseurl configuration. GUI doesn't display new base url, REST call ssh/1.0/settings doesn't return new baseurl as well.

Environment

Tested on: Bitbucket 6.x (tested up to 6.1), Bitbucket 5.15
(Optional - If Applicable)
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Steps to Reproduce

Stop Bitbucket Server.
Add:
plugin.ssh.baseurl=ssh://samplebaseurl
plugin.ssh.port=<sample_port_number>
to bitbucket.properties file.
Start Bitbucket Server.

Expected Results

SSH Base url is updated and visible in GUI.

Actual Results

Setting these parameters has no effect on SSH Base url.

Workaround

Set the SSH Base URL in UI.