It's fairly common to inject ground up tablets afaik. It's not that strange when considering the very variable quality of other commonly injected drugs. I never heard of injecting something like tea though, but it's not super surprising. Some people just don't care about anything.

People use horse dewormer to treat covid, it's really not surprising that they'd inject shroom juice.

If you want to learn about one case of this, there's a doctor on YouTube that does great narrative style videos of things like this that are very easy to understand with links to sources. He did a great video on this topic:

https://www.youtube.com/watch?v=vmiowRlk8Xc

An interesting tidbit I learned from that video is that psilocybin isn't known to be active, but your liver breaks it down to psilocin which is.

There is only 1 reported case that I know of. The person died when the fungus started to grow in their blood, a bad way to go.

This isn't drug culture. It is general human stupidity, ignorance, and curiosity in action.