So I have a problem where I changed the pose of the limbs ob one side of my rig, and then mistakenly made that the new rest pose. So I tried to copy the side that the limbs are still in the position I want and then X-flip them. But it either only moves a few of the bones or none. I have tried looking for answers but all the ones I found mean I either have to delete one side of the rig and symmetrize or go into edit mode and use x mirror and translate without changing anything. But both methods at least from what I can tell mean I have to apply weight painting again and I just finished it and in blender 2.8 and above it takes forever because of how they change the functionality since 7.9. Well and rerolling but that just made things worse. What do I do to make X-flip work again?