We should have a fix for this enabled by the end of the week 
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The fix should be live, let me know if you still encounter this issue!
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We are encountering issue with welds/motor6d/weldConstraints not updating Part1’s position locally when the Part0’s don’t move on the server but do move on the clients.
Yea I think it’s related unfortunately, reverting this fix as the decal bug is more prevalent.
Edit: reverted. sorry!
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I tried my test place out, just the truck and another car.
The fix you tried for the Motor6D seems to work, but it has become more ‘twitchy’ feeling.
I have the steer Script in my VehicleSeat (not a LocalScript as I want everyone in the game to see the movements properly) and the movement of the wheels while steering used to be really smooth but now seems a bit glitchy.
Occasionally when you try to steer the wheels lag behind and suddenly jump to their updated angle.
I also tried making the variables local but there was no difference in the movement.
The replication is still not working from client → server
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kleptonaut mentioned they reverted the fix since it was messing with decals…
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Still working on it. Hope to have it fixed either next week or the week after, but I will post here when it is.
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Thanks for the report! We’ve filed a ticket for this issue and we’ll follow up here when we have an update for you.
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Amazing. Any news as of 27/09/2020?
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Same question over here, are there any updates about the Motor6D fix? The ro-aviation community is severely affected by this.
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Do you have an update for us yet?
Planes are still looking like UFO’s in my game, the landing gear doesn’t show up for other players and the jet engines aren’t rotating.
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Thanks for everyone’s patience, a new fix has now been enabled!
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I’m able to look at this again with the new fix, and I think I see the jittering you’re talking about. When holding A or D to turn, it looks fine, but quick inputs are missed, and the the truck might jump to the new position after something else moves. Is this what you’re experiencing?
There should be a way I can improve this on my end, so I will look into it.
However, I think the root of your issue is your combination of physically simulated constraints & parts, with the animation based Motor6Ds. Motor6Ds aren’t really intended to be controlled at this fidelity, and often show odd behavior when used in directly with other constraints (like the springs). What’s happeneing is the tiny angle changes aren’t enough to wake the parts that are intended to move. It still should work obviously, but you may have a better time using a HingeConstraint, or other system for controlling the wheels.
Also, you would be able to still use a LocalScript for immediate feedback to the player, while keeping consistent, optimized replication to the server.
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Thank you so much! I’ve never been happier, literally.
@kleptonaut It appears that the motor6D is still not working as it used to do for me.
Its still not replicating the changes to other players.
This has broken every single propeller, landing gear, jet engine, water propeller and many more game mechanics in my game for other players.
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Very weird, car doors are working for me. Perhaps it’s the script?
I haven’t edited any script related to motor6d’s within 6 months in the game and the last update was 2 months ago and everything was working fine before.
Ah, strange then. Perhaps it only works for certainly made motors?