Yes, it's showing the AltUnity Tester dialog.
Although, server side execution is the same as local execution in the bitbar which is being confirmed by the bitbar team. the only difference is the execution is started and controlled by 'run-tests.sh' script from the test environment (where also the whole test project in located).& appium URL is set to localhost.
Then, why is it working on the server side execution. If port forwarding is not being implemented correctly then it's not working locally as well.