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Since https://github.com/RIOT-OS/RIOT/pull/21012 a netdev in the new API can return > 0 directly in netdev_driver_t::send() to indicate the driver is naturally synchronous and has already completed the transmission. The adaption of lwIP to that API change contained a bug: It handled the case after the thread is already blocked waiting for the signal that is never going to arrive. This is now fixed.