The extmetadata imageinfo property is generated via hook for local files, and requested from the remote api for ForeignAPIRepo files. For ForeignDBRepo/ForeignDBviaLBRepo files, however, it is simply ignored; since other Wikimedia projects access Commons as a ForeignDBviaLBRepo, this is quite the problem for tools that depend on extmetadata (currently, only MediaViewer).
Version: unspecified
Severity: normal