Physics engine somehow allows teleported players to phase through walls

Issue Type: Other
Impact: Low
Frequency: Constantly
Date First Experienced:
Date Last Experienced:

Reproduction Steps:
Uncopylocked repro game: https://www.roblox.com/games/6440747963/Uncopylocked-Teleport-Bug-Repro

Expected Behavior:
You shouldn’t be able to phase through the wall after being teleported past it.

Actual Behavior:

Once teleported past the wall, you can just turn around and walk right through it as if it wasn’t even there.

7 Likes

im getting the same issue but it only seems to happen when im hugging the wall

This impact is high in roleplay game

I feel like this is High impact. It’s really odd behaviour.

I am unable to repro this, perhaps it’s been fixed recently / hardware differences are causing it? I’m on Windows 10, however I see you’re on Mac
https://streamable.com/8w0der

This issue seems to have been fixed secretly in the background without being noted on this post. I can no longer reproduce it so I’ll mark it as solved.

Noting on to your reply, this bug occurred also for my friend who was running Windows 10 and hardware did not make a difference in our testing.

2 Likes

I am relatively sure that my problem is related to this. I am creating a custom character using mesh deformation, and am currently working on the movement mechanics. Yesterday at around midnight (GMT 0:00) me and my friends were messing around when we noticed that the character started spasming out as such:
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From what I can see it is trying to go back into its default pose from the idle animation, but it just goes back and forth. This doesn’t happen in the Studio “Play/Play here” version of the game, only if I join through the website.
And why I think it is related to your glitch is because we noticed that when these random spasms happened, it was possible to go through and into other objects:

This bug was not present mere hours prior, nor on any previous updates of my game. And while bugfixing I rolled back to older versions via “Configure Place” and “Version History” (dating back to 3/25/2021) and the exact same bug also happens. So I believe it to be an internal change, although there weren’t any Roblox updates so it is a mystery. And you also posted your reply about it being fixed around the time when my game got broken, so I think this weird silent update caused this.

At first I believed that this was a fault with my coding, but because I couldn’t find a fix I just gave up. We went to play the game Funky Friday, when suddenly I just walked into a car (and got stuck, unlike my friend who could freely walk through it.)
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So is this affecting every game? Likely, but I’m not sure.
I am not 100% sure if these problems are related, I’ll make my own thread with proper info if they aren’t.

Edit: I narrowed the weird animation stuttering to be because of humanoids/rootparts. I anchored the humanoidrootpart of the dummy and it stopped. Apparently it was pulling the player towards itself (No clue why) and thats what caused that spasming (it was actually trying to play the walking animation) It still happens between players tho.

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