Why does my distant horizons do this?

When distant horizons RENDERING is on, it looks like this: (first picture)
When the rendering is off, it looks like this: (second picture)
Why does it do this? How can i have rendering on and have the sunnier lightning with more sunrays? Do I have to wait for the chunk loading to be complete (it does not take 23 seconds as said by the ETA)
image.png
image.png
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