[BUG] M-S-<UP> does not adjust clock timestamps as described in docs [9.5.5]

[Robert Nikander]

Hi,

The docs say this about S-M + arrow keys on clock log lines. (In section: 8.4.1 
- Dates and Times > Clocking Work Time > Clocking Commands)

  ‘S-M-<UP>’ (‘org-timestamp-up’)
  ‘S-M-<DOWN>’ (‘org-timestamp-down’)
     On ‘CLOCK’ log lines, increase/decrease the timestamp at point and
     the one of the previous, or the next, clock timestamp by the same
     duration.  For example, if you hit ‘S-M-<UP>’ to increase a
     clocked-out timestamp by five minutes, then the clocked-in
     timestamp of the next clock is increased by five minutes.

But it doesn't seem to work like that. For example

   * Testing it out
   :LOGBOOK:
   CLOCK: [2023-02-07 Tue 12:35]--[2023-02-07 Tue 12:45] =>  0:10
   CLOCK: [2023-02-07 Tue 12:20]--[2023-02-07 Tue 12:30] =>  0:10
   CLOCK: [2023-02-06 Mon 12:20]--[2023-02-06 Mon 13:20] =>  1:00
   :END:

If I put point on the minutes of 12:30 (second line) and hit S-M-<UP>, it moves 
the time to 12:35, but nothing else moves. Based on the docs, I thought it 
would shift one of the other lines.

Rob


Emacs  : GNU Emacs 28.2 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 
Version 10.14.6 (Build 18G95))
 of 2022-09-12
Package: Org mode version 9.5.5 (release_9.5.5 @ 
/Applications/Emacs.app/Contents/Resources/lisp/org/)