Hello, i have the same Problem. I can "fix" & replicate it with my Thrustmaster Throttle.
To "fix" it i have to switch to crank, to off, to ign and then to norm. The EGT will go down slowly. Or if fast enough after loading not rising at all. I monitor the LVAR "INI_ENG1_EGT" with my Streamdeck so i dont have to switch on the Batterys
I can only guess the cause of this error.
But i can replicate the error if i switch to crank and back to norm. If i do that the EGT shoots up again.
Maybe this helps :)