In the end (rest in description)

when i go in that bedrock covered portal thing and come back to the main land, only a small peace of the chunk i'm in is usable. when i go in that bedrock covered portal thing and come back to the main land, only a small peace of the chunk i'm in is usable, for example, when i tp in the non-loading part of the main land, I JUST CANT DO ANYTHING, AND the ONLY way for me to get out of the non-weird state, is by using /kill and even when i tp OUT of the weird-non-loading-chunk(s) IT'S STILL INVISIBLE AND ALL WEIRD.