I own a 10 person realm which I play on with my friends, some of whom play on Xbox, some on mobile, and some on PC. I personally play on either usually PC, sometimes Xbox, and we play on survival, with no cheats. When we first fought the ender dragon about seven months ago, we got the usual levels and dragon egg, which I then took and put on display at spawn, but later that day when someone respawned and killed the dragon to open another gateway, they got another dragon egg, and the same XP as you do from the first fight. After fighting it for the third and fourth time, we didn't get more eggs or more XP than we should've. I thought nothing of it at the time and just assumed it was a 1 off glitch and that it would never happen again, however, around two months ago, on the morning of the nether update, I reset the world because most of us were starting to get burned out of the old one and because we wanted the new nether terrain. After a few days, we fought the dragon, and again, after the second fight, we got a second egg, and everything was normal in every fight after that. I looked on the wiki, and on some subreddits, but I could only find one instance of this happening: https://www.reddit.com/r/Minecraft/comments/cji6ai/bedrock_edition_somehow_got_two_dragon_eggs/ , but this question was never answered.