After generation in the new version of CubeMx 5.2.1, the working code with tcp server is no longer detected on the network. What could it be?

After generation in the new version of CubeMx 5.2.1, the working code with tcp server is no longer detected on the network. The code is based on the tcp echo server recommended in STM32Cube_FW_F4_V1.21.0. The ethernet and lwip code and settings have not changed.