Has anyone ever encountered such a problem

Hello, I bought a set of 80cc a while ago, I put it in and everything was fine, but soon I stopped that the candle was blurred very often and it went out and from the gear wheel to the chain it was constantly dripping oil while the engine was running, I disassembled the whole thought that it was from the gasket, but it turned out a small hole that comes out of the crankshaft to the outside and from there comes the problem of compression surprisingly the engine did not lose power because of the compression it is a factory defect I am posting the topic to inform you because I may even be the first to come across this turn Ski defect so someone else Does is such a thing?
 

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