Background not appear when it save

When i test the project, try add shape or line in backgroud. After i saved it and check the images, the shape or line is appear, but the background or image that added not appear. I want to fixed that but the backgroundImage not null when added images, make me really confuse

https://user-images.githubusercontent.com/72773420/219107601-64e14815-15f8-4518-86e6-67686e190c07.mp4

Start by reproducing the saved drawing with a background image and compare the saved output with the visible canvas, following the backgroundImage value mentioned in the report. Trace the save and image-rendering path until you find where the background is dropped; done means the background or added image remains visible after saving while shapes and lines still appear.

Written by the indexing model from the issue text.