Hi, indeed there is. EXPO is considered overclocking and therefore is not 100 guaranteed. If you visit 7800X3D official Web page you will see that for 2x2R memory 5200 is the maximum supported speed.
However, you can check board QVL to see if your memory kit it was tested with EXPO profiles by the vendor.
What can you try? Disable MCR. Thats what I did or I get BSOD or orange led light all the time.
Other stuff? Try DOCP profiles if available or put 5200/6000 manually.
More? If you want to stick with shorter boot times, then you need MCR enabled and power down mode too.
Update BIOS if all fails then clear CMOS and repeat.
I have 7950X with ASUS RoG X670E-A running 6000 and CL32 with a Gskill kit.
Good luck
The Englishman