I experienced exactly the same problem and somehow I could deblockthe key after a number of "operations". Thanks for this precise info!
BTW if you release the folding mechanism of the ignition key while inserted (the engine not yet started), the engine will start but immediately stop after a few turns of the motor... Just another quirk of the control electronics. Remedy: pull the key completely out and re-insert it (fully folded out) into the lock...