In caves:

And some map mods (like Traveller's map or FTB chunks) dont render.

My mods:

My PC:

ОS: Майкрософт Windows 10 Pro
CPU: Intel(R) Core(TM) i7-9700KF CPU @ 3.60GHz, 3600 МГц, cores: 8.
Video card: Radeon rx 570 series
RAM: 16,0 GB

If you could, please break it down to specific mods with issues, like:
Mod1: No Minimap
Mod2: wierd textures on this block
etc.

Okay, after some testing, i found:

minecolonies-0.13.261-ALPHA-universal : texture error stitching in caves

FTB chunks, Travellers Map and maybe some another map mod : no map rendering

Rats, Multibeds and maybe some another mod with high detail model : no texture render

Ok, better. if you could tag those with versions that would be helpful. As I've mentioned,
this is highly alpha and is gonna be a lot of work getting it working with all the forge addins,
so don't hold your breath. Currently working on some slightly more boring stuff.

FTB Chunks has been dealt with. Made a small addon mod which glues the two together as needed.

Actually, fixed in-mod. No second mod needed.

the white lines are not caused by minecolonies. occurs in my modpack without it.

I am also having this issue, seems to stem from Chlorine itself. FPS boost from this mod was incredible, excited to see how it grows.

Edit: should have specified, the block render lines are the issue I am also having