I've had the same issue.
I have an ASUS Z690 Formula m/b, a 12900K CPU and a G.Skill Trident Z5 Memory 2x16 GB memory kit. The system had worked without issues. I've upgraded the CPU to a 13900KS and had got that 55 memory error. Only one RAM stick had worked in a bank B, the second stick in a bank A caused the error during the POST. I had loosened and tightened a CPU cooler, it didn't affect anything. I had decided to check the old 12900K then and the system had worked ok with it. That was a good sign meaning the m/b isn't damaged. I've took the new 13900KS, cleared its contact pad with a cotton swab and isopropyl, installed it to the m/b and it works, the system passes the POST with the two RAM sticks.
So, my thoughts on that. Either the CPU contact pads are oxidized and need to be cleared a bit (someone stole the gold plating) or there is some little backlash between the CPU contact pads and the m/b pins. I would suggest to clear the CPU contact pad before install, slightly and carefully (!) move the CPU in a socket from side to side during install for a better contact between the CPU pads and the m/b pins.