I’ve noticed that canvas cubes which have their texture rotation changed will not save through snapshots or workshop map uploads.
Reloading a snapshot, or reloading the condo/workshop editor results in the object having defaulted back to no rotation. However, even though it has the appearance of having no rotation, the rotation value is still preserved in its settings (for example, having a cube with a rotated texture of 95 degrees is visually at 0 degrees, but in the objects edit menu it is still set to 95 degrees)
Here are some examples:
This is what these walls should be looking like
Here is what happens even after saving or uploading