I crashed in Overwatch, still counted as a loss and penalty

So I was playing placement matches, when my game crashed. i got nervous so i reconnected, only to find that i am in a penalty and it counted as a loss. Is there a way to fix this?

No, Blizzard doesn’t remove penalties for disconnect or crashes. Every disconnect, be it a game crash or an intentional or a non-intentional disconnect is penalized.

The only “fix” is trying to troubleshoot whatever caused your game to crash as to avoid it happening again in the future is by posting on the technical support forum or by creating a support ticket.

Is the loss from disconnecting heavier than a normal one?

No it’s not different.