Issue with Spring Constraint causing parts its attached to, to disapeer on Runtest

Hello, So I’m building a rope bridge and I’ve been trying different ways to get it to work in a way that it wont sag too much, I found a partial way but I’m now trying Springs for the top “rops” in hopes that it will keep it from sagging too much but able to still freely move.

I’m using rod constraints to connect each “plank” of the base of the bridge, and rope going from the base to the connecting parts for the upper support. the issue is when I run the game the whole thing disappears

, I have tried messing with the properties of the spring, and making the free length to the length of the gap. and upping damping, lowering stiffness etc thinking that its too stiff or something causing it to come apart.

forgive me its my first time really trying to make something using the springs, or constraints in general other then small testing them out or hanging rope in builds. Any advice would be great as I tried looking around and didn’t see anything

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Seems like its another issue, but it started after I used the springs, it is still doing it after I switched them to a different constraint

I have redone the base of the bridge and found a better way to do it and its working well, just got to work out some small kinks.