This article from yesterday is quite timely:

US NTSB probes 'stuck' rudder pedal issue on Boeing 737 MAX 8 flight

The safety board reported the captain said that during the landing rollout, the phase just after touchdown, the rudder pedals did not move in response to "normal" application of foot pressure while attempting to maintain the runway centerline.

https://www.reuters.com/business/aerospace-defense/us-ntsb-p...