The 13600T i have have some issues. When I clean the bios cpu don't work anymore. Need to place other cpu and replace after that.
I think have bad IMC controller or is just a dying intel brick.
That is very vague so I'll offer some vague responses.
Usually when a problem arises when I change something, the thing I changed has come with problems.
Perhaps the new bios is the issue and the old one was fine? It is a less common chip and some support for it may have dropped.
Also I have had issues with bios settings when reset to default when I was making a lot of changes and what fixed it was reflashing the bios. It seemed that not everything was resetting to optimized defaults when I chose that option and I had partially modified bios settings that weren't stable. The recognition of a new chip by the motherboard did a better job of resetting those unreset options. Reflashing the bios reset all of the options and gave a clean bios. But this was only on one or 2 motherboards. I think most do a good job.
Also I have had only one CPU ever fail (the mobile to desktop interposer on a 5950hq to LGA 1150 socket chip, specifically) and have had 2 bios chips fail. One from Ebay bought and one on a storebought motherboard. Both potentially failed from having the plug in chips shifted in their sockets. Both were fixed by replacements of the bios chip and the storebought one is still running fine in my daughter's PC.
Also I have had socket mounting issues with both delidded CPUs and adapted mobile CPUs. Some of which were from shifting the pc around with a big air cooler. I had to play around to get the socket mounting pressure right.
I'm bringing up bios and mounting because it sounds like bios resets cause the problem and remounting fixes them.
Maybe if you are using that old Audigy soundcard, or have some usb device plugged in that might be the issue. I have an old HT Omega Claro PCI soundcard that gets some fuss from a system that is running a UEFI bios, some old GPUs don't work on UEFI, and have had some troubles booting when some USB hardware is plugged in. Specifically a Creative SoundBlaster Play3(might be fried) and a usb DVD drive. I've also had a broken Hauppage TV card block bootup and have had a swapped out wifi card on a motherboard that came from the factory with a different one block startup.
These were all from LGA1150 motherboards though. But I have heard that if you aren't careful with one of those aftermarket CPU mounting plates that things don't work well. But both of the PCs I have that use them have been fine.
Perhaps you brought up IMC because you are getting a ram issue light or code with the 13600t that your temporary replacement CPU gets the jedec ram timings to work then your 13600t works with those same timings? I don't think motherboards change anything for jedec, but maybe some do. If it is a IMC related ram functionality problem, maybe starting on a "cleaned" bios with just one stick to be easier on the IMC will help, then you could go to 2? It would be easier and probably lower risk to your motherboard's fragile bits to try that first.