Some attachments from the old bugtracker site not showing on portal view

Some attachments (images and videos) that appear on a ticket on the old site are not present on the same ticket on the new site. Relates to [WEB-8365] and [WEB-8366], where the same pattern appears.

Example 1

[MC-148689] on old site – present

[MC-148689] at old url – present

[MC-148689] on new site – not present

Example 2

[MC-77732] on old site – present

[MC-77732] at old url – present

[MC-77732] on new site – not present