It’s strange isn’t it! And a little more convoluted than just psilocybin being legal.

For some reason there’s a loophole on the Netherlands, where psilocybin truffles are decriminalised, while their mushroom counterparts aren’t.

That might be something to do with the potency of LSD compared to the potency of truffles ; to do a heroic dose of truffles you need to consume over 25 grams (which is pretty time consuming). Whereas with LSD you can very easily ingest a few tabs.