What version of org-mode-doc do you currently have installed? It looks like the bug was fixed in 9.7.5-1 in there's now a /usr/share/info/orgguide.info.gz file.
But it was only accepted into unstable on 6-25, and may take a few days to make it to testing. Getting the fix into stable would take some effort and time. (I think it has to first be stable enough to go into testing, and then we could negotiate with the release team about adding an update to stable. Org mode might also make sense to build a backports version to have the close to the current release available to stable, though you'd have to get it from https://backports.debian.org/ >From the versions numbers I think you're on stable? Diane