Weird physics bug in Roblox Player but not studio

Hello, I’m working on a train system inside of Roblox, however I haven’t really worked on it for a while, but when I go to join the studio files in Roblox player app the train carriages appear to be flipped, however as soon as my player touches any part of the train everything goes back to normal, its just when I spawn into the game.
I haven’t made any changes to the game, so I imagine Roblox did a secret update? It does not happen in Roblox studio, and it only happens in the Microsoft app, and the same thing happens when I join on my iPad. So my main question is, did I miss something? is this a bug? do i need to attempt to fix it or just hope it fixes itself?

The issue:

This is how its supposed to look:

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Hi, its been about an hour and I’ve had zero responses… so wondering if anyone knows whether I need to take any action or if this is just a roblox problem?

Is it welded correctly or anchored?

Should be, it works perfectly fine in studio, I even republished it and it still has the issue in game. It was working perfectly in game a couple days ago, and then I join a couple days later and now its all messed up (I haven’t touched anything, and I’m the only one who has access to edit the game). As soon as my player touches any part of the train, it’ll go back to normal and no other issues occur

I have multiple different versions of this train system and it does this in all of them. Each version uses the same train models, rigs and constraints, but different maps and scripting differences.

If it fixes itself when a player touches it then it’s a loading issue. Any issues with the mesh? Do you have world streaming enabled (Instance streaming | Documentation - Roblox Creator Hub)?

If there is no issues with the mesh and no world streaming then my best guess is that this is a bug on Roblox’s end and you should file a Bug Reports with an exported version of the game

Yes, streaming enabled is on, however its always been on and there has never been a problem until now, and its weird that it works fine in studio but not player. Its happening across all my versions and I have not touched anything in any of them.

Not sure what’s wrong with it. My only thought is that this is an engine bug

I’ll try make a post later, too lazy right now lol

This bug began to happen in both studio and Roblox player, however it looks like its fixed itself! :partying_face:

From release notes 684, I reckon this was probably the cause?
image

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Seems like it. Good that they fixed it now!

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