oil stains are white

## Testmerges
#12174: 'Yautja Armor Sets' by realforest2001 at commit 90c66798ed
#12140: 'Tyrargo Rift - Various Alterations' by Steelpoint at commit 106761dc22
#12560: 'Refurbished Combat Information Centre - USS Almayer' by Steelpoint at commit ff42fe5f81
#12571: 'Stops hardened (crash proof) APCs from shorting out.' by realforest2001 at commit 0b5f5cb214
#11698: 'SHARP Resharpening: Design Improvements' by MPhonks at commit ecd26ee406
#12480: 'Sneaky Hijack Edgecase + Transmute Fixes' by Drulikar at commit d76bf3732d
#12519: 'Revert turf signal preservation + open_space tweaks' by Drulikar at commit 6d6bd7f31f
#12542: 'Xeno defensive grab' by Drulikar at commit c23567b747
#12585: 'stops traps going under jungle bushes' by realforest2001 at commit cf176673f7
#12573: 'Opensearch query builder' by fira at commit a65a14032b
#10925: 'Cape River Mining Colony - Ground Map' by Steelpoint at commit 642c2b7c6b

## Round ID
35188

## Description of the bug
for some reason oil stains are randomly white, like they're being left by a synth. (I suspect this may be due to the robotic parts that explode from doors/other items????)

## What's the difference with what should have happened?
oil stains should be the correct color.

## How do we reproduce this bug?
1. blow up a door
2. walk through the oil stain
3. it's white

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

## Additional details
- Author: SmellyHippie
- Admin: SmellyHippie
- Note: None

Reproduce the issue by blowing up a door and walking through the resulting oil stain, using round 35188 as the reported example. Trace the oil-stain behavior and the suspected robotic parts from destroyed doors or other items; done means oil stains consistently use their correct color rather than appearing white.

Written by the indexing model from the issue text.