[BUG] org-capture: %\N template expansion

[Bruno Cardoso]

Hi all,
I'm having trouble expanding the '%\N' template in org-capture.

For example, with the following template:

(add-to-list 'org-capture-templates
             '("t" "TEST" entry
               (file+headline "~/org/test.org" "TEST")
               "** TODO %?
:PROPERTIES:
:TITLE:    %^{TITLE}
:AUTHOR:   %^{AUTHOR}p
:END:
%\1 %\2"))

The properties are read correctly, but "%\1 %\2" expands to "%^A %^B".

Either escaping the backslashes ("%\\1 %\\2") or reading the template above 
from a file throws an error:

: org-capture: Capture abort: Wrong type argument: stringp, nil


Org mode version 9.7-pre (release_9.6.29-1474-g1c5492)


Best,

Bruno.