+, for some reason, some areas don't want to be rendered:

(also 6 report related to Multithreaded chunk rendering/occlusion engine)

another example of an area that is not rendering:

(This is not a tps/cwg problem, it is just not rendering)

does this version fix the problem? https://mega.nz/file/up0RUZyK#GcNB7D3PTuDG0MVdfCIzdIDyPvYEbC6Zq93V9gtfAmY

does this version fix the problem? https://mega.nz/file/up0RUZyK#GcNB7D3PTuDG0MVdfCIzdIDyPvYEbC6Zq93V9gtfAmY

it seems like no

Does F3 + A fix it?

Does F3 + A fix it?

no, even breaking/placing blocks doesn't load these places

Try removing all mods except optifine+mixins+fplib+falsetweaks, and see if the bug is still reproducible.

The bug with the chunks not rendering when above y=256 and looking in shallow angles is a known issue, but should not affect anything during survival play. Just stay under y=256 for now

Zoom issue:

I tried unimixins + falsetweaks 2.7.0 preview 1 (or 2, there is no difference), falsepatternlib 1.0.0 pre 0.2 and optifine (E7). Render distance - 16, to record the fragment below, I used /tp ~ 300 ~ (and yes, I fixed obs):

and also, I forgot to say, but you need to zoom not under yourself, but + - at the border of the render distance (or teleport to 500-600 Y, and set the render distance to 27-30, in this case, you can see it even not at the border of the chunks )

Some places are not rendered:

same thing, falsetweaks (+ deps) and optifine, error present

Fixed in preview 3

tested preview 3, can confirm that the problem is solved, thank you!