As far as I know, this bug affects at least 1.16.4, when you sleep in a bed below an end portal, and you don't have any other place to wake up other than in the portal, you enter the portal and get teleported to your relative overworld coordinates, rather than the obsidian platform. You can see in the screenshots that I actually got teleported into the void.
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@Garfieldwxg55
did you sleep in a bed below the portal so when you wake up in the portal you get teleported. (It also has to be night so you sleep in the bed)
Thank you for your report!
We're tracking this issue in MC-183899, so this ticket is being resolved and linked as a duplicate.
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I've tested this and I always spawn on the Obsidian platform...