Regression caused by9e4c26574a. Add strip stack as a key to the final cache. Use the pointer to the list of sequences, as it is the easiest one to obtain in all places where it is needed. This is slightly different from the code prior to the9e4c26574awhere strips.last() was used, but it allows to use the same logic in the prefetch job. Pull Request: https://projects.blender.org/blender/blender/pulls/141778