I start a new map with each update. Usually build in the same spot. I notice placing a resize square block that new flowers was giving the snapping issue to other blocks. One removed the flowers, it snapped without issue. Few blocks had flowers coming through blocks, until the flowers were removed.
Love the flowers, still need to see if sickle can give flower seeds to be moved or planted else where. If no flower seeds, treat them like other seeds. Add some color to our buildings.