Problems entering and exiting a Nether portal in 1.17

I have a problem, I just passed my world from 1.16.5 to 1.17, everything worked fine, I load my world correctly, but I wanted to use a portal for a new zone and generate new chunks with the 1.17 generation and I find an error that the chunks do not load only a small part later it does not load anymore this is solved by leaving and entering the world then I wanted to cross the portal again to go to the nether and the same error happens, they only load a few chunks and then nothing happens, the same close and enter the world but the error is repeated every time you enter and leave a portal I hope I am not the only one with this serious error and I hope it will be corrected as soon as possible ...