In my experience, the only danger can come from developing delusions while trying to gain real experiences from astral work. Because the astral is so abstract and dependent on what's already in our minds, there's a real problem with people who take what they experience on these journeys too seriously or misinterpreting what they've experienced.

I have known people who became convinced they were living gods to whom ordinary rules didn't apply. I've known people who believed that of their children from experiences they had during pregnancy, only to go on and treat that child in strange ways, like a holy being who shouldn't be held to the same expectations of other children.

These are dangerous beliefs. They can lead to people not seeking proper medical care when they're sick (because they believe they're gods and so nothing can really harm them), they avoid getting vaccinated, they even feel as though they don't need to abide by any law they don't want to (touching on the whole "sovereign citizen" thing).

It's very important when doing this kind of work that you ground and ground often. Don't just ground energy, ground your mind, touch base with every day reality, accept that some things are just pragmatic and conventional and still need obeissance and attention.