Not the same as #88, this is with a perfectly normal positive constant. Multiple times I've been blinked into solid blocks. That's with horizontal blinks, so it's not a headroom issue. At least once when I dug myself out I found myself in a small cavity well behind the wall I'd been facing. (4-5 blocks or so on a 7-block blink.)

Still happens in 1.12 (Psi r1.1-52) - blinking teleports inside and through the walls. Before seeing this issue open, I've actually believed this is the intended behaviour. Now... um, I still do, but I have some doubts.