I was having a constant teleport issue on my server when entering the nether in creative. Because of the vanilla feature where creative nether TPing is instant, I was being zooted to and from the nether and the overworld when I tried to go into the nether while in creative. Normally the way the feature works is that you get insta tped into the nether and then if you stand in the portal you just get a swirly screen until you go out and back in, but I think with the aether installed it does something that removes that feature so you just pop back and forth. I took all mods out except for the aether to be sure that it was an issue only with the aether and not any of my other dimension mods/QoL mods. I only tested if it happens on a server and not in single player.