When a new attachment version is submitted through the user interface the attachment loads no problem in the body of the page.
As of yesterday 1/14/2021 when I version a new attachment through the Atlassian Rest Api the attachment uploads fine and is downloadable but will not render in the page body. (This has been working for 8 months no issues)
'/rest/api/content/{page_id}/child/attachment/{attachment_id}/data'
When I query the attachment details with
/rest/prototype/1/content/{page_id}/attachmentsThe response is identical for the manual upload and the upload using the Rest API.