Describe the bug

Hello. I made a portal to nether and stood in it for about 10 minutes to move there, but no result. There is just a transition effect, you can safely exit the portal. I tried to do the same with nether and the end in another world in the creative, the same thing, when I try to go to the end, nothing happens. But aether and the twilight forest work. Is it possible to fix it somehow?

To Reproduce

Enter the portal of nether and the end

Expected behavior

So that you can go to nether and the end

Screenshots

No response

Modpack Version

3.1.1a

Server or singleplayer

Singleplayer

Version the world was created on:

3.1.1a

Other...

No response

Additional context

No response

you must kill the harvester to enter the nether and mine mythril to enter the end, this is not a bug