I'm not sure, it breaks the rig if I don't unrig it beforehand and for some, it still breaks even if I disconnect it. sorry for the late response, here is the project file:
https://drive.google.com/file/d/1eca2LtwagcHHbq8XVF1poP0e17gS8Vvw/view?usp=share_link
Thank you, there are three main errors as far as I can tell:
Error #1 As I suspected every body part was laid out as bitmap on the main stage without converting it to symbol.

Error #2 was parenting the bitmaps.
Error #3 was adding keyframes and animating those bitmaps creating duplicates in your library called Tween#1, Tween#2, Tween#3 etc.

These are common beginner mistakes. I recommend you to watch some tutorials about the basics of the software before attempting such a project. Here's a good place to start: https://www.youtube.com/watch?v=E-doxha22QI&list=PLmxcIrCbCbSjcG8Qw_cSF9lVZrF1-X56_&index=2
To summarize, everything should've been converted to symbol first before adding any keyframes.
When it comes to parenting, use it only with symbols, don't parent bitmaps, raw drawings, groups etc. Converting parented parts to vector will throw their position off.
Regarding your file, it isn't an easy fix, I managed to get rid of the bitmap disappearing issue somewhat by converting only the tiger to vector but still, all the other issues remain, consider starting from scratch if you're able to:
https://drive.google.com/file/d/1BKGTGHXNfh-wKVUw9E1SVJpTp5Skdi-k/view?usp=share_link