I just recently noticed there are no panel lights or gauge lights at night. The interior panel lighting seems to be in a engine off lighting scenario. With the engine on, interior panel lights should be on.
After further reproducing this bug within other relatively default scenarios, this bug definitely looks like a typical bug. If I'm not mistaken, the panel is lit during the day, but the panel does not light at night for some odd reason.
To further note, when turning on the engines of the To-199, the panel is activating the simulated LCD screen, but apparently the simulated LCD/LED back lighting is in a turned-off state. Hence, users can use the stated WORKAROUND of using night vision googles to read the simulated LED/LCD display.