Player facehugger not taking damage off of weeds

## Testmerges
#13027: 'Add Multi-Z handling to get_line' by MistChristmas at commit 7dee321554
#12985: 'Extending the MD ping animation' by Yachuk at commit c1891db738
#11128: '[code beet] dissolver (used to be venator)' by cuberound at commit 2e0f882986
#10925: 'Cape River Mining Colony - Ground Map' by Steelpoint at commit 15dd70a12a
#12947: 'Revert "Working multiz tacmap, round two, extra buttons"' by Rain7x at commit ea384007a4

## Round ID
36283

## Description of the bug
When walking off of weeds, I am not taking the damage over time a normal player facehugger is supposed to be taking.

## What's the difference with what should have happened?
I should be taking damage over time while moving off of weeds.

## How do we reproduce this bug?
1) Spawn as facehugger
2) Walk off of weeds
3) Continue receiving the benefits of full health

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

## Additional details
- Author: BoyNextDoor1
- Admin: Lagomorphica
- Note: None

Reproduce the issue by spawning as a facehugger, walking off weeds, and checking whether damage over time is applied. Trace the facehugger movement and weed interaction entry points; done means leaving weeds consistently applies the expected damage while preserving normal behavior elsewhere.

Written by the indexing model from the issue text.