Vent hatches don't appear to be welded when you're inside a vent

## Testmerges
#9894: 'Multiz indicator' by Detective-Google at commit 5dbc10a0d2
#10340: 'New on_mobs for splints, bandages and blood overlays (Other changes to blood included)' by LC4492 at commit 14a671a4e4
#10830: 'cm-live' by hry-gh at commit 7a043c2cbc
#10895: 'Moves SDTimeAward out of staff ranks.' by realforest2001 at commit c7aee3b53b
#10872: '[RM] Temporary Multi-Z Roof Layer' by thwompa at commit 9e9443f789
#10883: 'Blocks tiles you cannot view while looking up' by Git-Nivrak at commit 8d8f97d0ad
#10908: 'Adds additional checks to pouncing up a z level' by Git-Nivrak at commit b9d8d0d09b
#10926: 'Medals Overhaul' by realforest2001 at commit bf3b740af2
#7897: 'Hivelord Whisperer Construction Buff' by PhantornRU at commit a25dbc439d
#10375: 'Corporate Bodyguard' by realforest2001 at commit 901ede6453
#10925: 'Cape River Mining Colony - Ground Map' by Steelpoint at commit df1ca41935

## Round ID
30627

## Description of the bug
I crawled into a vent, used vents to go into LZ. I saw one hatch was welded, the others were not. I don't know if it's because they were welded after I entered the vent, but for the full duration I was in the vents the hatches appeared open on my screen.

## What's the difference with what should have happened?
The hatches should have shown the welded sprite, or had the description that they were welded. Instead it just doesn't let you exit the vent without telling you why.

## How do we reproduce this bug?
-Weld a vent hatch
-Enter the vents from a different hatch
-Get another hatch to be welded while you're inside the vent? Maybe? I'm not actually sure if this will reproduce the issue.
-Go back to the character in the vent, see if the hatch appears welded

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

## Additional details
- Author: ThiccFucc
- Admin: Vending Machine
- Note: vent looked welded to me