Please note: the original post mentioned the EOS R6 Mark II, that was obviously nonsense…
Canon released a firmware update for the Canon RF 70-200mm f/4L IS.
Canon RF 70-200mm f/4L IS firmware update 1.1.0:
1. Adds an electronic full-time manual focus function (a function that enables constant manual focus adjustment in both One-shot AF and Servo AF), which is enabled when using the EOS R5, EOS R6, and EOS R3 cameras.
2. Improves an issue in which the background is not blurred when performing slow panning with the IS (Image Stabilization) mode set to Mode 2 or Mode 3.