I spawned in the end for the first time. But the Ender Dragon and the portal were not there. (Also the End is laggy). I tried to summon an Ender Dragon with commands, but when it appeared it didn't move and I can't kill it.
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Sonicwave
migrated
Thanks for your report; however this issue has been previously reported as MC-137467. There is also a workaround given in that ticket (placing an End Crystal on top of obsidian will generate the portal).