[O] unable to edit indirect-buffer in fundamental mode without losing pretty printing in base buffer org mode

[Van L]

Hello.

Is it possible to edit a buffer in org mode 
and its indirect-buffer in fundamental mode 
without losing pretty printing in the org mode base buffer?

At the indirect-buffer, I switch to fundamental mode and 
that causes the base buffer in org mode to 
lose the pretty printing for superscript, subscript. 

The two mode lines are set: org mode and fundamental mode. 

I drop into fundamental mode to adjust the curly braces for 
super/subscripting and want to see the changes in the base buffer
in org mode.

I use the following to create the indirect buffer.

  clone-indirect-buffer-other-window

Org mode version 9.1.9
GNU Emacs 26.1-rc1