The cache invalidation worked on basis of timeline frame instead of
frame index, which caused, that these images were outside of range, that
was considered to be changed, after strip was moved.
In this case the issue happened only with effect strips. This was not
an issue before, mainly because raw images for these strips were not
stored. For other strip types, raw image does not usually change.
This seems to be "caused" by f4f708a54f .
Pull Request: https://projects.blender.org/blender/blender/pulls/124870
6a39d79967