So, after few days of gameplay and interactions with a game I am Rank 16 and can state that i have got:

ZERO ISSUES WITH A GAME

1. No problems with Secure Boot;
2. No problems with TPM 2.0;
3. No game crashes;
4. No game freezes.

The only problem i got even BEFORE game started at 7 Aug was Early Access Code activation (no confirmation message) due to high load on server (probably).

The only problem i got when game was pre-loaded - error about old GPU driver after i started a game. No problems since that!

Only one thing i don't like and have to fix by myself - game menu have no FPS cap, so i fixed it in NVIDIA Control panel by adding game and turn on VSync for it. VSync in game still was disabled.

PC Specs: 

CPU: AMD Ryzen 7 5800X3D (might be even with Curve Optimizer "-30" on All Cores, i dont' remember);

Motherboard: ASUS ROG Crosshair VIII Dark Hero (BIOS v5002);

TPM 2.0: ASUS TPM-M R2.0 (external module)

RAM: 4x8GB Team Group Xtreem DDR4-3800_CL15, 1.48V (Overclocked);

GPU: EVGA GeForce RTX 3080 Ti FTW3 Ultra Gaming (12GB, driver v580.88, Resizable BAR "ON") 

SSD #1: 500GB Samsung SSD 980 Pro (System);

SSD #2: 1TB Samsung SSD 990 Pro (Games, BF6 OB EA installed here)

PSU: Seasonic PRIME Ultra 850W (Titanium).

OS: Microsoft Windows 11 Pro 24H2 (build 26100.4652)

I have got only one warning in Event viewer during OS boot: Event 360 and only one error - Event 2042. For both Microsoft told - safe to ignore them.