Launcher: Minecraft Launcher
Optifine Version: OptiFine_1.16.5_HD_U_G8
Forge Version: 1.16.5-forge-36.1.32
Version: 1.16.5

Mod List:
https://gist.github.com/zndrmn/69d0f824c09daf351f8ced4aa500b271#file-mods-2021-07-14_18-56-22-txt

Latest Log:
https://gist.github.com/zndrmn/55c23247eb00569e28d4ab55992817f1#file-latest-log

Debug Log;
https://gist.github.com/zndrmn/1b8133884dc1ba9fe51cbd511ca11cbf#file-debug-log

Crash Logs:
https://gist.github.com/zndrmn/bb48162b8a110030f66b926109c58478#file-crash-2021-07-14_18-56-10-server-txt
https://gist.github.com/zndrmn/bb48162b8a110030f66b926109c58478#file-crash-2021-07-14_18-56-22-client-txt
https://gist.github.com/zndrmn/bb48162b8a110030f66b926109c58478#file-crash-2021-07-14_18-59-09-server-txt

I had the same problem in 1.12 my game would not launch and stayed in the task manager.
In fact if you remove konkrete + fancymenu it should work again.

I had the same problem in 1.12 my game would not launch and stayed in the task manager. In fact if you remove konkrete + fancymenu it should work again.

Oh same thing just happened to me. Very unfortunate incompatibility.

Thanks to this issue, i was able to confirm it's a mod bug :) (sadly)
While i do hope this bug get's fixed someday, this is what you need to do to fix it, and keep the rest:

# Set this to false to disable the Minecraft class patches (the Toggle Narrator keybind and custom window title/icon).
# Default: true
B:patchMinecraftClass=false

by disabeling this, it won't patch the classes it conflicts, thus making it all work again :)