Mirroring a wall makes it so it can't deal fall damage

[pepiscola-cpu]

Disclaimers

• I have searched the issue tracker to check if the issue has already been reported.
• My issue happened while using mods.

What happened?

If you mirror any wall in the game by X then it will stop doing fall damage to anyone, doesn't do stun or blunt force trauma. Technically if you hit some part of your body on the wall that isn't your legs (say your torso) then it will deal fall damage.

Reproduction steps

1. go into subeditor (or host a game with a submarine with the required conditions in step 2 & 3)
2. Make a submarine that has a horizontal wall with the box "Mirror X" turned on, and a drop onto it from a sufficient height to do fall damage
3. Make another drop onto a non-mirrored horizontal wall from the same height
4. Drop onto both walls and see what happens

Bug prevalence

Happens every time I play

Single player or multiplayer?

Happens in both single player and multiplayer

-

No response

Version

v1.11.5.0 (Winter Update 2025 Hotfix 1)

-

No response

Which operating system did you encounter this bug on?

Windows

Relevant error messages and crash reports

No error message is made.

[NilanthAnimosus]

Thank you for the report!

I cannot seem to reproduce the issue, I tested using a typhon 2 with three different kinds of wall down the ladder and tested without and with X and Y mirroring, and in all cases took roughly the same amount and odds of damage (and pretty much always to the legs).

sometimes I would get no fall damage, but the rate of this was about the same with or without the mirroring, on both shell 0 degrees and large horizontal inside walls as well as another. Is there a specific wall or example that causes this?

[pepiscola-cpu]

2026-01-22.17-18-23.mp4

Huh, thats weird. Are you sure you didn't have anything that might have changed your results? Like a different OS or any mods installed?
As you can see from the video everything happened as I described, and obviously assuming you got the results you did this would have to mean we have some kind of difference, right?
If there's any more information you might need I'd be more than happy to give it!
It could also be that you don't have the correct testing environment, and things like ladders or platforms could be messing up the experiment.

[evilfactory]

Thank you for providing more information, converting to issue ticket.

[evilfactory]

Fix has been merged into the private repository and will be included in the next update!