Blur Tool Brush Function Leaves Depth Colors in Photos

When using the brush function of the blur tool, the colors representing depth remain visible in the photo. For example, when I paint over the area I want to focus on with the brush while displaying depth, it turns purple. However, this purple color remains even after hiding the depth, and it also remains when exporting the image.

This phenomenon occurs only in the Android Lightroom app, while it appears correctly in the PC version. Is this a bug?