FOSS gamedev and creative worlds

It happens verry rarely, but sometimes when I place a node near another node, the first replaces the second. For example, I just tried to place an apple near some cobblestone, and the apple took the place of the cobblestone.

I have no idea how to replicate the error, but this isn't the first time it has happened.

This might be the problem. I saw this in the API earlier.
buildable_to = false, -- If true, placed nodes can replace this node

That would in deed cause the problem, but as the title of this topic states, it happens with nodes that are NOT buildable_to. In other words, buildable_to = false. Thanks though.