Show intermediate test results in the panel
The panel remains empty while the tests are running. It would be nice to print the intermediate test results while the test runner is running.
The panel should be updated incrementally. Is it!?
I don't see any incremental updates. ST 4084 on Linux.
Not sure if you mean this.

ST 4084 on macOS.
By the way, are you using deferred testcases?
Yes. A mixture of regular unittest.TestCase and unittesting.DeferredTestCase even.
I've been updating NeoVintageous to Python 3.8 in ST4 and have similar issues.
I've narrowed the issue down to the UnitTesting reloader. The reloader causes random failures.
In NeoVintageous (st4 branch) the tests randomly fail and the test panel can remain empty like described above.
When I comment out the reloading code it works, but obviously I need to restart ST when I make changes to the plugin:
https://github.com/gerardroche/UnitTesting/commit/dcfec0b4878064fe6e29b8fca706c497b0eb9fc2
With the above change the NeoVintageous tests run fine, .
For my PHPUnitKit plugin I replaced the reloader code with (AutomaticPackageReloader plugin):
sublime.active_window().run_command('package_reloader_reload')
That seemed to work for PHPUnitKit but not for NeoVintageous.
Reloader issues are fixed by 1.6.0+