Even without a texture pack enabled, skeletons spawn with broken bows. I've tried this with more than one world and got the same result. I also tried it with the classic texture pack but this still didn't work. It is also broken on all of my textures. I am confused as this doesn't seem to be a texture pack issue. I would attach a video of my testing but there is a file limit unfortunately. Edit: logging out of Minecraft and back in seems to fix this, but i still don't quite know what's happened. It could have been the worlds, but they were freshly made and it happened on the realm too, so is there a possible reason for this? Or is it some random error?