Bug: Clock date range with the enclosing markup <> are not fully supported [9.4.4 (9.4.4-27-gb712b9-elpaplus)]

[Firmin Martin <firmin.martin@ens-lyon.fr>]

I have manually changed a clock date range in a task's logbook using the
shortcut =C-c .= (org-time-stamp). It modified the Org timestamp to the
date I wanted, but changed the enclosing markup from [] to <>. I didn't
pay much attention on it as C-c C-c (org-ctrl-c-ctrl-c) updated
correctly the total time.

But it happens that the change from [] to <> markup is enough to let

- clock table
- org-agenda-columns' CLOCKSUM_T property

completely ignore the clock entry I modified. I tested that after
changing the enclosing markup from <> to [], everything works as
expected. BTW, org-lint reports nothing on this.

Below is a minimal not working example.

1. In ~/test.org, put the following content.

* TODO Task
  SCHEDULED:<2021-03-13 sam. ++1d>
  :PROPERTIES:
  :Effort:   1:00
  :LAST_REPEAT: [2021-03-12 ven. 12:39]
  :END:
  :LOGBOOK:
  - State "DONE"       from "TODO"       [2021-03-12 ven. 12:39]
  CLOCK: <2021-03-12 ven. 09:15>--<2021-03-12 ven. 12:15> =>  3:00
  :END:

2. Insert the dynamic clock table and press C-c C-c on it

#+BEGIN: clocktable :scope ("~/test.org") :maxlevel 8 :block 2021-03-12
#+END:

the task does not show up. 

3. Put this file in your agenda files and set agenda columns 

(add-to-list org-agenda-files "~/test.org")
(setq org-columns-default-format-for-agenda "%50ITEM(Task) %2PRIORITY %10Effort(Effort){:} %10CLOCKSUM_T")

4. Now open org agenda in "columns mode"

(org-agenda-list)
(org-agenda-columns)

The task's CLOCKSUM_T field is empty.

5. Finally, replace the CLOCK property timestamp enclosing markup from <> to [] in
test.org. Try again 2. and 4.



Emacs  : GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, cairo version 1.16.0)
 of 2021-01-20
Package: Org mode version 9.4.4 (9.4.4-27-gb712b9-elpaplus)