This is Noble rom, an android 12 custom rom for the Galaxy Note 9 and S9 by AlexisXDA on XDA. It has some bugs but nothing that's deal breaker, some stuff have
Samsung Galaxy S9/S9+ and Galaxy A51 receive One U... - Samsung Members
Samsung Galaxy S9 - official renders, straight from the Samsung application! :: GSMchoice.com
Samsung Galaxy S9 and Galaxy S9+ can now boot official TWRP
XDA on X: "How to fix the missing OEM Unlock button on the Samsung Galaxy S9/S8/Note 8 https://t.co/bM0B4WnwMh https://t.co/4MEDY7dxBb" / X
ROM][A320FL/F/Y] H-ROM S9 PORT V2.0 [Pie][OneUI][64 bits][Treble] | XDA Forums