chunks dissapearing behind you, also I need to manually fly to load chunks despite world generated

Hello, I have this world that I generated a while ago, it was from a server which no longer exists. The chunks were already loaded obviously but DH still would not load all the chunks, I thought it was ram allocation, so I increased it. Still doesn't work. I then ended up using a mod called "Chunky" which can generate chunks for you just to make sure these chunks are really loaded in, but still not working. Now after flying around I notice that chunks disspear behind me. What causes that?

(Also no shader issues related as I tested it in vanilla too)
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