Z-Level Roof glitches

## Testmerges
#11589: 'byondoidc' by hry-gh at commit 80574d4a6d
#11660: 'achievement integration' by hry-gh at commit cb1b1a3b36
#11677: 'Xenomorph on dropship alert now only occurs after landing' by carlarctg at commit 5d4d3c1257
#11636: 'Fix: Cades stacking on top of each other.' by MistChristmas at commit 03c79f5178
#11615: 'Xeno Fire Immunity Refactor x2 + Hive Fire Resistance Buff' by Drulikar at commit e425813335
#9774: 'Adds a minesweeper game to a bunch of interactions.' by kiVts at commit bd1bb5d5be
#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4
#11661: 'Despoiler rework' by Git-Nivrak at commit 5994d5ad76

## Round ID
32371

## Description of the bug
On various parts of various Z-Leveled maps without second floors. (All sloped roofing) You can find spots that you can leap at to teleport to the other side, sometimes even into the LZ

## What's the difference with what should have happened?
You should've just slid back off into the place you leapt from.

## How do we reproduce this bug?
Step 1: Look up
Step 2: Pounce on a certain corner tiles, especially those next to walls a floor up
Step 3: Teleportation powers.

## Attached logs
```
We pounce at the sloped roof!
Prime Lurker (SID-156) slams into the rock wall!2
We pounce at the sloped roof!
Prime Lurker (SID-156) slams into the rock wall!7
We pounce at the sloped roof!
Prime Lurker (SID-156) slams into the rock wall!4
```

## Additional details
- Author: Acetylene
- Admin: Westrover
- Note: None