Ventura logon screen problem

When login in after verbose my display connected to dGpu DP turn off for a moment (no signal) then after a few seconds the login screen will appear and it looks like HDR problem (washed up tint and 60hz).

When logged in the display is normal.

Specs: Core i5 10400 Rx 6600xt SMBios iMac 20,1

What I have tried so far, removing -v, boot debug, apple debug, adding agdpmod=pikera