I Disconnected And Lost A Filled Shulker Box On My Friends Realm

I was on my friends realm going to the end once again to teleport back to my house when i disconnected going through the portal. Then when i rejoined my shulker box full of riches dissapeared and progress of moving my house went away. The shulker box had almost a stack of diamonds 3 netherite ingots 1 scrap 12 gold blocks 7 gold 63 guilded blackstone bricks 6 lapis blocks almost a stack of both obsidian types 4 sea lanterns almost a stack of glowstone blocks almost a stack of shulker shells 3 dragon heads 1 dragon egg like 6 stacks of iron blocks but i get more easily and more i cant remember at the moment. can this bug please oh please be fixed because i dont want to go through the grinding again and now im not sure if i can even respawn the ender dragon...