I have an assembly with a linear component pattern. It's configured for different types, and for each type I'm using derived configurations for lengths.

The instance count of the linear component pattern is different for each length.

This assembly is then placed into an assembly at a higher level, and everything is fine until I close the model.

When I reopen the top level assembly it messes up the pattern and seems to just scatter a random number of components along the pattern axis. Sometimes all of the components of the pattern and sometimes just a few.

This appears to only happen to the configuration that is used in the top level assembly.

Clicking edit feature on the component pattern and clicking ok fixes the problem until I close the model again, and when I open it the problem is back.

Am I doing something wrong? Is it not possible to use derived configurations like this, or is it just a bug?