ovh.atlasinc.ap.web.dashboard.renderers.page.ConfluenceMediaFetcher#queryContent
if two threads call this function at approximately the same time, fetchMediaIdsMapping(docId) will be called twice, because until the first CompletableFuture completes, there is no docId in queriedDocIds.

example:
ovh.atlasinc.jira_issue_html_renderer.JiraAdfToHtmlComparingMediaFetcher#supplyMapping(ovh.atlasinc.connect.jira.Issue)

the second thing is that the docId is unique only in a given space, so when there are e.g. /include to other spaces, it may be repeated
example new default media fetcher for confluence:
https://bitbucket.org/warsawdynamics/atlassian/src/ea6ab9ed8beb616b3af0f04dc80b88859853e9c0/confluence-page-html-renderer/src/main/java/ovh/atlasinc/confluence_page_html_renderer/ConfluenceMediaFetcher.java?at=PEFC-3-Create_application

Also we could work on issue fields support for external user in APFJ since they are now available in PDF Export.