End gateway threw me off the map

I made an account to report the issue, because I am pretty mad about what happened. With full mending gear I tried to go end busting, but when I went through the end gateway, the dragon knocked me into the air and off the map. The thing that I don't understand is that I had already defeated the ender dragon in that world, so there should not have been a dragon there. As soon as I teleported through, I got tossed with no time to react. I can tell that something tossed me because all of the chorus trees around the gateway had been broken, as though the dragon ran through them. I really wish that I recorded it, but I forgot to clip it afterwards. I think this is a unique problem, because I looked online for a solution but didnt find anything, but it seems like a ton of people are having trouble with the End after the update. Please get this fixed!!!!!