We encountered the same issue but found seemingly an extravagant workaround. What we tried (first successful in creative, then almost successful on the Realm): we build a TNT cannon to shoot an empty Minecart from almost max. buildlevel up to the Shulker where it sits on 512 (must be exactly below the shulkers position). The Minecart will catch the Shulker and fall with the passenger to a prepared platform (at max. buildlevel) with rails on it for soft landing but then in survival we forgot to close the hole of the TNT cannon - wich is important because the Shulkercart will land at the exact same coords from where it sat above. And our Minecart with the Shulker somehow landed there half besides the rail and it died (in creative all went well, it landed at the closed hole and survived). Now we struggle to get new shulkers to the overworld - they were sent through the portal but did not come down to 512 yet. I will update you after the next possible try. More info: Our Level from where we shot the TNT is 312 and we used 5 pieces of TNT dispendes through 5 different dispensers. 4 Pieces were just a little bit to few, more than 5 were too high and it did not work. We tested slimeblocks for the landing as well but the bouncing was weird and it bounced off the edge and died. So... sorry for the open ending but maybe you could start to work with that instructions and will be more lucky with shulkers arriving at 512.
Edit: finally a new shulker arrived in the sky and it worked exactly as described above 😃
Oeppi1914
We encountered the same issue but found seemingly an extravagant workaround. What we tried (first successful in creative, then almost successful on the Realm): we build a TNT cannon to shoot an empty Minecart from almost max. buildlevel up to the Shulker where it sits on 512 (must be exactly below the shulkers position). The Minecart will catch the Shulker and fall with the passenger to a prepared platform (at max. buildlevel) with rails on it for soft landing but then in survival we forgot to close the hole of the TNT cannon - wich is important because the Shulkercart will land at the exact same coords from where it sat above. And our Minecart with the Shulker somehow landed there half besides the rail and it died (in creative all went well, it landed at the closed hole and survived). Now we struggle to get new shulkers to the overworld - they were sent through the portal but did not come down to 512 yet. I will update you after the next possible try. More info: Our Level from where we shot the TNT is 312 and we used 5 pieces of TNT dispendes through 5 different dispensers. 4 Pieces were just a little bit to few, more than 5 were too high and it did not work. We tested slimeblocks for the landing as well but the bouncing was weird and it bounced off the edge and died. So... sorry for the open ending but maybe you could start to work with that instructions and will be more lucky with shulkers arriving at 512.
Edit: finally a new shulker arrived in the sky and it worked exactly as described above 😃
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