Scrambled/corrupted graphics

On Rive Beta 0.8.1894 R, I imported a lottie JSON into a new file in a new workspace.

I made some changes, then I quit the Rive app. After I opened it back, all the graphics were scrambled/corrupted as if raster images were vectorised in Illustrator.

It was supposed to look like this:

This is how the file looks like:

Edit: All the files I added to the new workspace are corrupted.