Xenomeat Pizza Slicing

## 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

## Round ID
32373

## Description of the bug
When one makes Meatpizza using Xenomorph Meat, slicing the meat reverts the xenomeat pizza into regular meat pizza slices.

## What's the difference with what should have happened?
I expected xenomeat pizza slices that have acidic blood in them.

## How do we reproduce this bug?
Make Xenomeat Meat Pizza
Slice it
Voila

## Attached logs
```
N/A
```

## Additional details
- Author: Vershze
- Admin: the mistchristmas
- Note: None

Reproduce the issue by making Xenomeat Meat Pizza and slicing it, then inspect the code path responsible for pizza slicing and the resulting meat slices. Done means the slices remain xenomeat slices and retain the expected acidic blood behavior.

Written by the indexing model from the issue text.