Haidrgna
Tester
This placement issue mostly happens with blocks that are considered terrain decoration (like spikes) but always seems related to the block snapping to something nearby (like grass, uneven terrain, other nearby blocks). If the ground is flat and free of grass is happens far less, but when in a hurry to place spikes in a grassy uneven field you bet you will misplace a few of them and might get one planted where you stand.This is not the first time, I've seen someone write about this.
I've never had that happen ever, while playing... I tried to provoke it after reading others getting this. I succeeded using a flagstone block, but was easily able to get free (without breaking the block). I do see how it sucks a little with the spikes.
I would be interested in seeing a video of the gameplay. Perhaps you are playing in a weird way, that I dont know of... How else could this keep happening to you?