[R-SIG-Mac] Problem R with Big Sur

[Univ-Rouen]

Dear all,
I have change my MacBook Pro since a few months and now, I have a MacBook Pro 16 with a Touch Bar. 
Yesterday, I have updated my computer with Big Sur and now, when I open R (4.0.3), I have this message when R opens or every time a window opens:

2021-01-05 09:55:30.150 R[1275:42594] Warning: Expected min height of view: (<NSPopoverTouchBarItemButton: 0x7f9f306b3f50>) to be less than or equal to 30 but got a height of 32.000000. This error will be logged once per view in violation.

Before updating to Big Sur, I had not this problem with Catalina.
Has anyone had the same problem? How can I fix it?
Many thanks,
Aurélie