(1.16.4) Portal duplicates when exiting custom dimension.

Hi, I have a bug to report for the current snapshot of MCreator 2020.6 (Now referred to as 2021.1). When I create a portal for a custom dimension, the game likes to "move" the portal when you return to the overworld from said dimension. When I say "move", I mean "create a new portal in the position that the game wants it, and always use it as the exit portal no matter how you do the entrance portal". I don't know how anyone else has reported this problem yet, but it's pretty annoying. Could someone else let me know if they've encountered this problem themselves, and if you're a developer, could you please see what you could do about fixing this for the next snapshot? I would really appreciate it!

P.S. Here is an image of what I'm talking about. On the right is the portal I made (all fancy and stuff with dirt bricks), and on the left is the portal that the game made. I'm pretty sure this isn't supposed to happen.