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Bug: Given less rating points

I just played against a bot and won. Game link is lichess.org/NVOvyiQd/white
The bot was 1900+ but I won only 4 rating points. The bot lost 8 points, but I won only 4. Why is it so???
Usually bot vs human takes and gives less rating points as the rating of the bot is most of the time built by playing other bots. So as an example: BOT A vs BOT B starts. Now they play many games and build a reliable rating. The rating built by BOT A is by playing BOT B and lichess expects that both bots play their best. So now if we assume BOT B and BOT A both used Stockfish 12, so you are nothing in front of it. So lichess deducts and increases small amount of rating from both but the change is normal in BOT vs BOT

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