Bug / Crash Rod loses initial shape when forced

[chenji]

There is rod with some bended initial shape and I push it into place where it's not possible to keep this shape fully. In my case it's some kind of tunnel collider.
The problem is that rod loses it's shape during that operation, like it had plastic deformation enabled. Meanwhile plastic creep and yield is set to 0.
Is that expected outcome?

Example of such a deformation below.
All constraint values are set to default (0).

The doc says: https://obi.virtualmethodstudio.com/manu...aints.html

Plastic yield
Strain threshold that marks the transition from elastic to plastic deformation. Low values will make it easier to permanently deform the constraint. At high values it will take more violent deformation to permanently deform the constraint.

So set it to 0 is wrong in your case. But it also says this so I assume there is a bug as percentage 0 should mean no deformation.

Plastic creep
Once the plastic yield threshold is surpassed, plastic creep determines what percentage of the deformation is permanently absorbed by the constraint.