simularium files that have "_all" ie, use time, meshes don't work 

## Description
when running a bunch of packings, and then saving them all in one simularium file, if the containers are meshes, they don't load. 




## Expected Behavior
They should load and be consistent across the packings 



## Reproduction
*A minimal example that exhibits the behavior.*




## Environment
*Any additional information about your environment*
