R5 13/14 bit files

I am sure I have read somewhere in the R5 manual that when using high speed mode (H+) or the electronic shutter that the file bit depth reduces from 14 to 13. Surely this must affect the dynamic range. I only shoot in raw.
Does anybody know if this is the case with the R5 MKII, or does it use 14 bit files for all shooting modes.