When me and my friend throw ender pearls at the end gateway at the main end island, it teleports us to the main end portal (the one to get out of the end). I'm playing windows 10 and he is playing android. We have gone through it before today and it took us to an actual island that wasn't the main end island. I tested it 4 times, each time teleported to the same spot right by the main end portal.

Steps to reproduce:
Walk up to end portal gateway on main island.
Throw ender pearl.
Get teleported to exactly 5, 62, -2; which is a few blocks away from the end portal to get back to your overworld spawn point.
With water:
Walk up to end portal gateway.
Put water down so you can swim through the gateway.
Get teleported to the same cords, with momentum sometimes taking you to -1 instead of -2.

Observed Results: Attempted to use the end portal gate way 10 times with ender pearls, was unable to teleport to an end island away from the main end island. Then used water to swim into the portal 5 times and got the same result. Each time was teleported to the same cords at the main end island: 5, 62,-2; when sometimes swimming through, momentum from swimming will carry you to 5, 62, -1.

Expected Results: To be teleported to a end island 1000+ blocks away from the main end island.
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This is the only end island gateway we have spawned so far. I have tested this on my personal realm but the end island gateway worked as intended there. The end island gateway on my friends realm does not work even if only one player is online, it was tested multiple times with 1-2 other people on and did not work then either. It was tested on pc.

I also tested to see if distance from the end gateway mattered, I went 20 blocks away and threw the ender pearl at it and got the same results as observed. The above observed result was done with only one person online. Prior to 2 days ago, the end island gateway was working as intended as far as I know.