Im having trouble with the "resume from checkpoint" option when rendering through husk. It saves the checkpoint file but when I kill the husk process and restart the rendering it just starts from the beginning and overwrites the checkpoint file?

Resuming from checkpoint requires you to use the exact same USD file. If the timestamp changes on the USD file, then Karma will assume that something has changed in the scene.

Rendering with higher verbosity should help diagnose why the checkpoint file is ignored. With verbosity of 2, look for messages that contain "Invalid checkpoint ..."