[O] fonts not scaling when zooming in column mode

[Al]

Hello,

When I use column-mode (C-c C-x C-c) and change the font size (using
C-x C-= or C-x C--), all the characters outside the column-mode change
correctly, but the ones displayed by the column-mode stay at the same
size.

Is there any solution to make column mode follow the global font size ?

I tried with many fonts from several types without success:
- emacs -q -fn Inconsolata test.org
- emacs -q -fn fixed test.org
- emacs -q -fn Sans test.org
....

I'm on a linux debian testing distribution, using emacs 26.1+1-3.2 and
org-mode version 9.1.14+dfsg-3.

Thanks.

-- 
Al