You will always have fungus because nature abhors a vacuum. Nearly all the grow blocks are lions mane or oyster, so if they’re dormant there, they have primacy. They’re safe mushrooms. In theory, you would have less bad fungus because of the good.

The block itself is exclusively the spent grains grow media and mycelium, the “roots” if you will. The spores live exclusively in the fruiting body. If the block is dry, there is no fruiting body.

Here’s some I was going to compost, but they got rained on. Ignore the algae. You’d be getting dry blocks, and they wouldn’t be ugly like this. The white is the roots of the mushroom. Just really corky fiber.