This is never necessary and is potentially lethal.
Correct it or have it corrected as soon as you can.
It is worth noting that you can get
wiring reversals in sockets that allow properly wired appliances to work
AND reversals in appliances that allow them to work with properly wired sockets
but the two faults together may be non functional.
I saw this happen where a "sleepout" was wrongly wired and a tape player was wrongly wired. The player would work everywhere except when plugged into power in the sleepout. I was asked to find out what was wrong and to fix it. In the process I discovered that when the player was plugged into the sleepout power outlet , phase (live) appeared on its "grounded" body. Had earthed metal been present nearby a fatality could have occurred.