Is it to be expected that upgrade of CP will revert firewall to default settings?

I run the upgrade script (from 1.9.x to 2.0.1), and everything seemed to be fine (no errors).

I noticed that I couldn’t access OLS interface after the update.

It would seem the updated reverted my CP Firewall rules. Port 7080 was no longer open.

Is this to be expected after each upgrade, that the firewall settings will revert to some default configuration?