I continued my test with EF 24-105L f/4 IS and EF 70-200 f/2.8 L IS II.
This two lens haven't chip serial number, the 1DX not recognizes the serial number lens.
My 40mm STM pancake have a chip serial number, the 1Dx recognize serial number lens
For the lens have serial number, it works correctly, you can switch lens, the settings are saving.
But for the lens haven't chip serial number, the settings are not recorded, the camera see each time a new lens.
Made the test with your lens, switch between several lens.
I hope Canon saw this problem...