So me and my friends have a all of fabric 3 smp, and we went too the end and there was no dragon, we deleted the end file and reloaded it and there still was no dragon..? is this a bug or..?

I'm having the exact same issue actually! I'd love to get to hear a fix to this one if you've found one.

Curious what host you both are using? The issue is that the world level.dat file has a bunch of craft on it that is not from our pack. If you have spent any time in the world, I would create a world in single player with the same seed, then copy the level.dat file from your saves folder and replace the one on the server. You should also probably delete both dim1 and dim-1 folders, which will delete the nether as well, but it's generation settings are also messed up. If you could send me the level.dat to confirm this that would be great. The last person who had this, who might be the issue creator, had something called infiniburn inside the generation settings for both the end and the nether.

still issue with latest version?