Is it acceptable not to display the official license plate when the temporary one hasn't expired?

[CamillaFitz]

Temporary license plates cannot be used once official plates are issued, regardless of whether the temporary plates have expired or not. Below are the relevant details: 1. Explanation: Temporary license plates are used temporarily before obtaining the official ones. Once official plates are received, the vehicle must be driven with them. Temporary plates become invalid as soon as official plates are issued, regardless of their expiration status. Therefore, vehicle owners must install the official license plates on their vehicles immediately upon receipt. 2. Maximum duration for temporary plates: For new vehicles purchased by ordinary consumers for temporary driving within the same administrative region, temporary plates are issued for a maximum of 15 days. For temporary driving across different administrative regions, temporary plates are issued for a maximum of 30 days.