Apparently patrols can spawn in the end again. I believe this was fixed in a previous update but this happened minutes ago on the latest update (not snapshot/beta). I was using a flat world with an exposed end portal but I doubt it likely that the whole patrol managed to get on the mainland from an isolated obsidian platform with no bridge that has ever existed.
Thank you for your report!
We're already tracking this issue at MCPE-51481, so I will resolve and link this ticket as a duplicate.
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