Displayed timerange is truncated with repeated timestamps and customized org-timeblock-scale-options

```
(with-temp-file "/tmp/test-agenda.org"
  (insert "** Test
<2024-11-04 Mon 00:00-16:00 +1w>"))
(setopt org-timeblock-files '("/tmp/test-agenda.org"))
(setopt org-timeblock-scale-options '(6 . 22))
(org-timeblock)

;; The displayed timerange is correct on 2024-11-04, but on the
;; following week, it is unexpectedly truncated to only one hour.
```