Focal: strange behavior of the prompt for the tcsh shell

[Uwe Brauer]

Hi 

I am running a Thinkpad X1, and upgraded from 16.04 to 20.04.

I always use the tcsh shell, with the following setting 
set prompt   = '%B%n@%m:%~\n%T %#%b'


That worked perfectly since 16.04

However now when repeat a command with left arrow up and then 
use the right and left arrow keys of my keyboard the
cursor jumps the line and make it hard to modify the last command.

Any pointers or information would be highly welcome 

Thanks and regards

Uwe Brauer